kěn
to gnaw
to nibble; to bite
啃书
kěn shū
lit. to gnaw a book
啃老
kěn lǎo
(coll.) to live with and depend on one's parents even upon reaching adulthood
啃老族
kěn lǎo zú
(coll.) adults still living with and depending on their parents
嘴啃泥
zuǐ kěn ní
to fall flat on one's face