SUCK UP Meaning of SUCK UP in English GROVEL, creep, toady, be obsequious, be sycophantic, kowtow, bow and scrape, truckle; fawn on; informal lick someone's boots, be all over. 2192; headword Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012