gauntletyoudaoicibaDictYouDict[gauntlet 词源字典]
gauntlet: The gauntlet of ‘run the gauntlet’ has no etymological connection with gauntlet ‘glove’ [15]. The latter was borrowed from Old French gantelet, a diminutive form of gant ‘glove’. This was originally a Germanic loanword, with surviving relatives in Swedish and Danish vante ‘glove’. As for ‘running the gauntlet’, it was to begin with ‘running the gantlope’, in which gantlope signified ‘two lines of people armed with sticks, who attacked someone forced to run between them’.

This was borrowed in the 17th century from Swedish gatlopp, a descendant of Old Swedish gatulop ‘passageway’; this was a compound noun formed from gata ‘way’ (related to English gate, gait) and lop ‘course’ (related to English leap and lope). Under the influence of gauntlet ‘glove’, English changed gatlopp to gantlope, and thence to gantlet (now restricted in use to an ‘overlapping section of railway track’) and gauntlet (as in ‘run the gauntlet’).

=> gait, gate, leap, lope[gauntlet etymology, gauntlet origin, 英语词源]
allay (v.)youdaoicibaDictYouDict
Old English alecgan "to put down, remit, give up," a Germanic compound (cognates: Gothic uslagjan, Old High German irleccan, German erlegen), from a- "down, aside" + lecgan "to lay" (see lay).

Early Middle English pronunciations of -y- and -g- were not always distinct, and the word was confused in Middle English with various senses of Romanic-derived alloy and allege, especially the latter in an obsolete sense of "to lighten," from Latin ad- "to" + levis (see lever).
Amid the overlapping of meanings that thus arose, there was developed a perplexing network of uses of allay and allege, that belong entirely to no one of the original vbs., but combine the senses of two or more of them. [OED]
The double -l- is 17c., a mistaken Latinism. Related: Allayed; allaying.
crumby (adj.)youdaoicibaDictYouDict
1731, "full of crumbs," from crumb + -y (2). Overlapping somewhat with crummy, but generally restricted to the more literal senses.
lap (v.2)youdaoicibaDictYouDict
"to lay one part over another," early 14c., "to surround (something with something else)," from lap (n.). Figurative use, "to envelop (in love, sin, desire, etc.)" is from mid-14c. The sense of "to get a lap ahead (of someone) on a track" is from 1847, on notion of "overlapping." The noun in this sense is 1670s, originally "something coiled or wrapped up;" meaning "a turn around a track" (1861) also is from this sense. Related: Lapped; lapping; laps.
louver (n.)youdaoicibaDictYouDict
also louvre, early 14c., "domed turret-like structure atop a building to disperse smoke and admit light," from Old French lovier, of uncertain origin. One theory connects it to Medieval Latin *lodarium, which might be from a Germanic source (compare Old High German louba "upper room, roof;" see lobby). Another suggests it is from French l'ouvert, literally "the open place," from le, definite article, + past participle of ouvrir "to open." Meaning "overlapping strips in a window (to let in air but keep out rain)" first recorded 1550s. The form has been influenced by apparently unrelated French Louvre, the name of the palace in Paris, which is said to be so named because its builder, Philip Augustus, intended it as a wolf kennel. Related: Louvered.
overbite (n.)youdaoicibaDictYouDict
"overlapping of the lower teeth by the upper ones," 1887, from over- + bite (n.).
overlap (v.)youdaoicibaDictYouDict
"to partially extend over," 1726, over- + lap (v.). Related: Overlapped; overlapping.
shingle (n.1)youdaoicibaDictYouDict
"thin piece of wood," c. 1200, scincle, from Late Latin scindula (also the source of German Schindel), altered (by influence of Greek schidax "lath" or schindalmos "splinter") from Latin scandula "roof tile," from scindere "to cleave, split," from PIE root *sked- "to split." Meaning "small signboard" is first attested 1842. Sense of "woman's short haircut" is from 1924; the verb meaning "to cut the hair so as to give the impression of overlapping shingles" is from 1857.
splint (n.)youdaoicibaDictYouDict
c. 1300, "overlapping plate or strip in armor" (made of metal splints), probably from Middle Low German splinte, splente "thin piece of iron," related to Middle Dutch splinte "splint," probably literally "thin piece cut off," and from a Germanic offshoot of PIE *(s)plei- "to split, splice" (see flint). Cognate with Danish splint "splinter," Swedish splint "wooden peg, wedge." Meaning "slender, flexible slip of wood" is recorded from early 14c.; specific surgical sense is attested from c. 1400.
adjunctionyoudaoicibaDictYouDict
"The joining of two sets which without overlapping jointly constitute a larger set, or the relation between two such sets", Late 16th century: from Latin adjunctio(n)-, from the verb adjungere (see adjoin).
allopatricyoudaoicibaDictYouDict
"(Of animals or plants, especially of related species or populations) occurring in separate non-overlapping geographical areas", 1940s: from allo- 'other' + Greek patra 'fatherland' + -ic.