noun
ingratiating smile; coquettish smile
A smile intended to charm or attract someone, often with a nuance of flattery or seeking favor. Rare term; more commonly expressed as 媚びるような笑い or 愛想笑い.
See also: 媚笑
彼女は媚び笑いを浮かべて近づいてきた。
She approached with an ingratiating smile.
あの俳優の媚び笑いがどうも苦手だ。
I can't stand that actor's coquettish smile.
愛想笑い is a polite or social smile, often without romantic intent, while 媚び笑い specifically implies flattery or seduction.
媚びる is the verb meaning to flatter or fawn; 媚び笑い is the noun for the smile itself.
Compound of 媚び (kobi, 'flattery, fawning') + 笑い (warai, 'smile'). The exact historical derivation is uncertain, but the word is formed from standard Japanese elements.