Coerce
late Middle English: from Latin coercere ‘restrain’, from co- ‘together’ + arcere ‘restrain’.
wiktionary
From Latin coercere(“to surround, encompass, restrain, control, curb”), from co-(“together”) + arcere(“to inclose, confine, keep off”); see arcade, arcane, ark.
etymonline
coerce (v.)
mid-15c., cohercen, "restrain or constrain by force of law or authority," from Old French cohercier, from Latin coercere "to control, restrain, shut up together," from assimilated form of com- "together" (see co-) + arcere "to enclose, confine, contain, ward off," from PIE *ark- "to hold, contain, guard" (see arcane). The unetymological -h- was perhaps by influence of cohere. Related: Coerced; coercing. No record of the word between late 15c. and mid-17c.; its reappearance 1650s is perhaps a back-formation from coercion.
