engage (v.) Look up engage at Dictionary.com
early 15c., "to pledge" (something, as security for payment), from Middle French engagier, from Old French phrase en gage "under pledge," from en "make" + gage "pledge," through Frankish from Proto-Germanic *wadiare "pledge" (see wed). It shows the common evolution of Germanic -w- to French -g-, as in Guillaume from Wilhelm). Meaning "attract the attention of" is from 1640s; that of "employ" is from 1640s, from notion of "binding as by a pledge." Specific sense of "promise to marry" is 1610s (implied in engaged).