1
general::
Phrase(s): suck up to someone
Sl. to attempt to gain influence with or favor from someone. • In school, Richard was always sucking up to the teacher. • Don’t suck up to me. It won’t do any good.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Behave obsequiously towards, ingratitate oneself with, as in Now that he's the boss they're all sucking up to him, hoping to get big raises. [Vulgar slang; mid-1800s]
American Heritage Idioms