'suck up' definitions:

verb

Take in, also metaphorically; "The sponge absorbs water well"; "She drew strength from the minister's words" [syn: absorb, suck, imbibe, soak up, sop up, suck up, draw, take in, take up]

verb

Ingratiate oneself to; often with insincere behavior; "She is playing up to the chairman" [syn: cozy up, cotton up, shine up, play up, sidle up, suck up]

verb

Try to gain favor by cringing or flattering; "He is always kowtowing to his boss" [syn: fawn, toady, truckle, bootlick, kowtow, kotow, suck up]