inchoative verb
Definition - A verb that denotes the beginning of a process, an action, or a state.

Example -

(1) In English, the verbs darken (to grow dark) and thicken (to grow thick)
(2) In Latin the verb calesco, to grow hot.

Etymology -
The term derives from the Latin incohare, to begin (from in, on + cohum, strap fastened to the oxen's yoke).

Oxford English Dictionary -
Its first citation is from 1530:
"They knowe neyther frequentatyves, nor inchoatyves, nor no suche sortes of verbes."
(Jehan Palsgrave, Lesclarcissement de la langue françoyse, 403)

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