恃 (w)

(shì) to rely on; mother (formal)

恃强欺弱 (w)

(shìqiángqīruò) to use one's strength to mistreat people (idiom); to bully

恃才傲物 (w)

(shìcáiàowù) to be inordinately proud of one's ability; to be conceited and contemptuous (idiom)