suck up

Short definition from Wiktionary

Verb

1. 1
   To absorb (fluid).
2. 2
   To adulate or flatter (someone) excessively, generally to obtain some personal benefit or favour.
3. 3
   To fellate (someone).

Noun

1. 1
   A person who sucks up, or plays up through adulation or flattery or other such devices to win another's favour; a brown-noser.