slideyoudaoicibaDictYouDict[slide 词源字典]
slide: [OE] Slide comes from a prehistoric Germanic *slīd- ‘slide, slip’, which also produced English sled, sledge, sleigh, and slither [OE]. Its ultimate source was the Indo-European base *slei- or *lei-, a prolific source of words for ‘slide’. A version with -dh- on the end lies behind slide, and is also responsible for Greek olisthánein, Lithuanian slysti, Latvian slīdēt, and probably Welsh llithro ‘slide’. A version suffixed -b- produced English slip, and one ending in -g- has spread throughout the Slavic languages, giving Russian skol’zit’, Czech klouznouti, etc, all meaning ‘slide’.
=> sled, sledge, sleigh, slither[slide etymology, slide origin, 英语词源]
slide (v.)youdaoicibaDictYouDict
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 (n.)youdaoicibaDictYouDict
1560s, from slide (v.). As a smooth inclined surface down which something can be slid, from 1680s; the playground slide is from 1890. Meaning "collapse of a hillside, landslide" is from 1660s. As a working part of a musical instrument from 1800 (as in slide-trombone, 1891). Meaning "rapid downturn" is from 1884. Meaning "picture prepared for use with a projector" is from 1819 (in reference to magic lanterns). Baseball sense is from 1886. Slide-guitar is from 1968.