生齧り[namakajiri] superficial knowledge
聞き齧る[kikikajiru] to have a smattering knowledge of
齧り散らす[kajirichirasu] to gnaw at and scatter around
齧りつく[kaburitsuku] to bite into
齧歯類[gesshirui] rodent

齧る[kajiru] to chew
脛齧り[sunekajiri] sponging off one's parents
食い齧る[kuikajiru] to nibble at
齧歯目[gesshimoku] Rodentia
親の脛を齧る[oyanosunewokajiru] to depend on one's parents' (financial) support