supplicate

From Late Middle English supplicaten (“to request (that someone do something)”) [and other forms], borrowed from Latin supplicātus (“prayed”) + Middle English -en (suffix forming the infinitive of verbs). Supplicātus is the perfect passive participle of supplicō (“to pray, supplicate; to beg, humbly beseech”) (see -ate (verb-forming suffix) for more), from sup- (variant of sub- (prefix meaning ‘below, beneath, under’)) + plicō (“to bend, flex; to fold; to roll up”) (ultimately from Proto-Indo-European *pleḱ- (“to fold; to plait, weave”)).