Endeavor

Endeavour - Wikipedia

endeavor - Wiktionary, the free dictionary

Etymology

The verb is from Middle English endeveren (“to make an effort”); the noun is from Middle English endevour, from the verb.

Endeveren is from (putten) in dever (“(to put oneself) in duty”),

from in + dever (“duty”), partially translating Middle French (se mettre) en devoir (de faire) (“(to make it) one's duty (to do), to endeavour (to do)”)

(from Old French devoir, deveir (“duty”)).