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bait: bait: [13] Etymologically, the verb bait means ‘cause to bite’. It comes from Old Norse beita, a causative version of bita ‘bite’ (related to English bite). This took two semantic paths in English. In its aggressive mode, it meant literally ‘set dogs on someone’, and hence by figurative extension ‘harrass, persecute’. More peaceably, it signified ‘feed an animal’.

And this sense of ‘food provided’ is reflected in the noun bait, which comes partly from the verb, partly from the related Old Norse nouns beit ‘pasturage’ and beita ‘fish bait’. Old Norse beita was probably borrowed into Old French as beter, which with the prefix aproduced abeter, source of English abet [14], originally meaning ‘urge on, incite’.
=> abet, bite
instinct: instinct: [15] The etymological notion underlying instinct (and also the closely related instigate) is of ‘goading onwards with a pointed stick’. Its ultimate source is Latin instinguere ‘urge onwards, incite’, a compound verb formed from the prefix in- ‘on’ and stinguere ‘prick, goad’. Source also of English distinct and extinct, this goes back to the same root, *stig-, as produced English stick and Latin stīgāre ‘prick, goad’, the ancestor of English instigate [16].

The noun derived from it, instinctus, originally meant ‘incitement, instigation’, but it eventually moved on to ‘impulse’, the sense it had when English acquired it. The more specialized ‘innate impulse’ developed in the mid 16th century.
=> distinct, extinct, instigate, stick
edge (v.): late 13c., "to give an edge to" (implied in past participle egged), from edge (n.). Intransitive meaning "to move edgeways (with the edge toward the spectator), advance slowly" is from 1620s, originally nautical. Meaning "to defeat by a narrow margin" is from 1953. The meaning "urge on, incite" (16c.) often must be a mistake for egg (v.). Related: Edger.
further (v.): Old English fyrðran, fyrðrian "to impel, urge on; advance, promote, benefit;" see further (adv.). Compare Middle Low German vorderen, Old High German furdiran, German fördern, probably from their respective adjectives via the notion in phrases such as Old English don furðor "to promote." Related: Furthered; furthering. After the further/farther split, this sense also continued in a shadow verb farther (v.), attested from 16c. but apparently dying out 19c.
hormone (n.): 1905, from Greek hormon "that which sets in motion," present participle of horman "impel, urge on," from horme "onset, impulse," from PIE *or-sma-, from root *er- "to move, set in motion." Used by Hippocrates to denote a vital principle; modern meaning coined by English physiologist Ernest Henry Starling (1866-1927). Jung used horme (1915) in reference to hypothetical mental energy that drives unconscious activities and instincts. Related: Hormones.
impel (v.): early 15c., from Latin impellere "to push, strike against, drive forward, urge on," from assimilated form of in- "into, in, on, upon" (see in- (2)) + pellere "to push, drive" (see pulse (n.1)). Related: Impelled; impelling.
instant (n.): late 14c., "infinitely short space of time," from Old French instant (adj.) "assiduous, at hand," from Medieval Latin instantem (nominative instans), in classical Latin "present, pressing, urgent," literally "standing near," present participle of instare "to urge, to stand near, be present (to urge one's case)," from in- "in" (see in- (2)) + stare "to stand," from PIE root *sta- "to stand" (see stet). Elliptical use of the French adjective as a noun.
instigate (v.): 1540s, back-formation from instigation or else from Latin instigatus, past participle of instigare "to urge on, incite" (see instigation). Related: Instigated; instigates; instigating.
instigation (n.): early 15c., from Middle French instigation and directly from Latin instigationem (nominative instigatio), noun of action from past participle stem of instigare "urge on, incite," from in- "in" (see in- (2)) + *stigare, a root meaning "to prick," from PIE root *steig- "to prick, stick, pierce" (see stick (v.)).
hormesis: "The phenomenon or condition of a substance or other agent having a beneficial physiological effect at low levels of exposure even though toxic or otherwise harmful at higher levels", 1940s. From Hellenistic Greek ὅρμησις rapid motion, eagerness from ancient Greek ὁρμάειν to set in motion, impel, urge on (from ὁρμή rapid motion forward, onrush, impulse from the base of ὄρνυσθαι to urge on, make rise, of uncertain origin (but apparently Indo-European) + -σμα, extended form of -μα: see -oma) + -σις.