suck up in WordNet English dictionary

1. take in, also metaphorically
   "The sponge absorbs water well"; "She drew strength from the minister's words"
   absorb  suck  imbibe  soak up  sop up  suck up  draw  take in  take up 
   
2. try to gain favor by cringing or flattering
   "He is always kowtowing to his boss"
   fawn  toady  truckle  bootlick  kowtow  kotow  suck up 
   
3. ingratiate oneself to; often with insincere behavior
   "She is playing up to the chairman"
   cozy up  cotton up  shine up  play up  sidle up  suck up 
   

suck up in English Wiktionary