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portcullis [portcullis 词源字典]: portcullis: [14] A portcullis is etymologically a ‘sliding door’. The word comes from Old French porte coleïce, a term made up of porte ‘door’ (source of English port, as in porthole) and coleïce ‘sliding’. This was a derivative of the verb couler ‘slide’, which came ultimately from Latin cōlum ‘sieve’ (source of English colander [14]).
=> colander, porch, port, portico[portcullis etymology, portcullis origin, 英语词源]
backslide (v.): in the religious sense, 1580s, from back (adj.) + slide (v.). Related: Backslider; backsliding (1550s).
cursor (n.): computer sense is 1967 extension of name for the sliding part of a slide rule or other instrument (1590s), earlier "a running messenger" (c. 1300), from Latin cursor "runner," also "errand-boy," from curs-, past participle stem of currere "to run" (see current (adj.)).
flextime (n.): also short for flexitime, 1972, translating German Gleitzeit "sliding time." See flex + time (n.).
lubricant (adj.): "reducing friction," 1809, from Latin lubricantem (nominative lubricans), present participle of lubricare "to make slippery or smooth," from lubricus "slippery; easily moved, sliding, gliding;" figuratively "uncertain, hazardous, dangerous; seductive," from PIE *sleubh- "to slip, slide" (see sleeve).
portcullis (n.): also port-cullis, c. 1300, from Old French porte coleice "sliding gate" (c. 1200, Modern French porte à coulisse), from porte "gate" (see port (n.2)) + coleice "sliding, flowing," fem. of coleis, from Latin colatus, past participle of colare "to filter, strain" (see colander).
rain (v.): Old English regnian, usually contracted to rinan; see rain (n.), and compare Old Norse rigna, Swedish regna, Danish regne, Old High German reganon, German regnen, Gothic rignjan. Related: Rained; raining. Transferred and figurative use of other things that fall as rain (blessings, tears, etc.) is recorded from c. 1200.

To rain on (someone's) parade is attested from 1941. Phrase to rain cats and dogs is attested from 1738 (variation rain dogs and polecats is from 1650s), of unknown origin, despite intense speculation. One of the less likely suggestions is pets sliding off sod roofs when the sod got too wet during a rainstorm. (Ever see a dog react to a rainstorm by climbing up on an exposed roof?) Probably rather an extension of cats and dogs as proverbial for "strife, enmity" (1570s).
skid (n.): c. 1600, "beam or plank on which something rests," especially on which something heavy can be rolled from place to place (1782), of uncertain origin, probably from a Scandinavian source akin to Old Norse skið "stick of wood" (see ski (n.)). As "a sliding along" from 1890; specifically of motor vehicles from 1903. Skid-mark is from 1914.

In the timber regions of the American West, skids laid down one after another to form a road were "a poor thing for pleasure walks, but admirably adapted for hauling logs on the ground with a minimum of friction" ["Out West" magazine, October 1903]. A skid as something used to facilitate downhill motion led to figurative phrases such as hit the skids "go into rapid decline" (1909), and see skid row.
slide (v.): Old English slidan (intransitive, past tense slad, past participle sliden) "to glide, slip, fall, fall down;" figuratively "fail, lapse morally, err; be transitory or unstable," from Proto-Germanic *slidan "to slip, slide" (cognates: Old High German slito, German Schlitten "sleigh, sled"), from PIE root *sleidh- "to slide, slip" (cognates: Lithuanian slystu "to glide, slide," Old Church Slavonic sledu "track," Greek olisthos "slipperiness," olisthanein "to slip," Middle Irish sloet "slide").

Meaning "slip, lose one's footing" is from early 13c. Transitive sense from 1530s. Phrase let (something) slide "let it take its own course" is in Chaucer (late 14c.). Sliding scale in reference to payments, etc., is from 1842.
slide-rule (n.): also slide rule, mathematical calculating tool, 1838, from slide (v.) + rule (n.). So called for its method of operation. Earlier sliding-rule (1660s).
slither (v.): early 15c., variant of Middle English slidder "to slip, slide," from Old English slidrian "to slip, slide on a loose slope," a frequentative form of slidan "to slide" (see slide (v.)). For spelling change, compare gather. Meaning "to walk in a sliding manner" is attested from 1848. In reference to reptile motion, attested from 1839. Related: Slithered; slithering.
slur (n.): "deliberate slight, disparaging or slighting remark," c. 1600, from dialectal slur "thin or fluid mud," from Middle English slore (mid-15c.), cognate with Middle Low German sluren, Middle Dutch sloren "to trail in mud." Related to East Frisian sluren "to go about carelessly," Norwegian slora "to be careless." Literal sense of "a mark, stain, smear" is from 1660s in English. The musical sense (1746) is from the notion of "sliding." Meaning "act or habit of slurring" in speech is from 1882.
spade (n.2): black figure on playing cards," 1590s, probably from Italian spade, plural of spada "the ace of spades," literally "sword, spade," from Latin spatha "broad, flat weapon or tool," from Greek spathe "broad blade" (see spade (n.1)). Phrase in spades "in abundance" first recorded 1929 (Damon Runyon), probably from bridge, where spades are the highest-ranking suit.
The invitations to the musicale came sliding in by pairs and threes and spade flushes. [O.Henry, "Cabbages & Kings," 1904]
Derogatory meaning "black person" is 1928, from the color of the playing card symbol.
telescope (v.): "to force together one inside the other" (like the sliding tubes of some telescopes), 1867, from telescope (n.). Related: Telescoped; telescoping.
bilboes: "An iron bar with sliding shackles, formerly used for confining a prisoner’s ankles", Mid 16th century: of unknown origin.