From mid-14c. with senses "lose one's footing," "slide out of place," "fall into error or fault." Sense of "pass unguarded or untaken" is from mid-15c. That of "slide, glide" is from 1520s. Transitive sense from 1510s; meaning "insert surreptitiously" is from 1680s. Related: Slipped; slipping. To slip up "make a mistake" is from 1855; to slip through the net "evade detection" is from 1902. To let (something) slip originally (1520s) was a reference to hounds on a leash; figurative use "allow to escape through carelessness" is from 1540s.
"depart suddenly and secretly," especially to escape debt or the law, 1560s, from French abscondre "to hide" and directly from Latin abscondere "to hide, conceal, put out of sight," from assimilated form of ab "off, away from" (see ab-) + condere "put together, store," from assimilated form of com- "together" (see com-) + -dere "put" (from PIE root *dhe- "to put, place"). Related: Absconded; absconder; absconding.
"to slide, slip, or glide away; pass away with or as if with a continuous gliding motion," used of time, 1640s, from French elapser, from Latin elapsus, past participle of elabi "slip or glide away, escape," from ex "out, out of, away" (see ex-) + labi "to slip, glide" (see lapse (n.)). The noun now corresponding to elapse is lapse, but elapse (n.) was in recent use. Related: Elapsed; elapsing.
mid-14c., pinnen, "to affix with a pin," from pin (n.). Figurative uses, on the notion of "seize and hold fast in the same spot or position" are from 1570s. Related: Pinned; pinning. Sense of "to hold someone or something down so he or it cannot escape" is attested from 1740. In U.S. colleges, as a reference to the bestowal of a fraternity pin on a female student as an indication of a relationship, it is attested by 1938. Phrase pin down "define" is from 1951.
From the condition of a hunted animal comes the transferred sense of "final encounter," and thence, on the notion of turning to face the danger when further flight or escape is impossible, at bay.