noun
flattery; cajolery; flirtation
Refers to ingratiating behavior, often with a nuance of insincerity or trying to win favor. Can be used for both social flattery and flirtatious charm.
彼女の上司への媚びにはうんざりする。
I'm fed up with her flattery toward the boss.
彼の笑顔にはどこか媚びがあった。
There was something ingratiating in his smile.
Derived from the verb 媚びる (こびる), meaning to flatter or curry favor. The noun form 媚び is the continuative stem (連用形) of the verb.