啃 hang² {kěn}

1. to gnaw
2. to nibble
3. to bite

啃老 hang² lou⁵ {kěn lǎo}

(coll.) to live with and depend on one's parents even upon reaching adulthood

啃書〔-书〕 hang² syu¹ {kěn shū}

1. lit. to gnaw a book
2. to study
3. to cram

啃老族 hang² lou⁵ zuk⁶ {kěn lǎo zú}

(coll.) adults still living with and depending on their parents