From Longman Dictionary of Contemporary Englishsuck up phrasal verb informal1 FRIENDLYto say or do a lot of nice things in order to make someone like you or to get what you want – used to show disapproval to He’s always sucking up to the boss.2 suck it up American English to accept an unpleasant situation without complaining → suck→ See Verb table
Examples from the Corpus
suck to• Very quickly these two understood that they could persecute anyone they cared to as long as they sucked up to Chutra. 