Enforce
Middle English (in the senses ‘strive’ and ‘impel by force’; formerly also as inforce ): from Old French enforcir, enforcier, based on Latin in- ‘in’ + fortis ‘strong’.
wiktionary
From Old French enforcier, from Late Latin infortiāre, from in- + fortis(“strong”).
etymonline
enforce (v.)
mid-14c., "to drive by physical force; to try, attempt, strive; to fortify, strengthen a place;" late 14c. as "exert force, compel; make stronger, reinforce; strengthen an argument; grow stronger, become violent," from Old French enforcier "strengthen, reinforce; use force (on), offer violence (to); oppress; violate, rape" (12c.) or a native formation from en- (1) "make, put in" + force (n.). Meaning "compel obedience to" (a law, etc.) is from 1640s. Related: Enforced; enforcing.
