恃强欺弱

tā tǐng shēn fǎn kàng nà xiē shì qiáng qī ruò de rén zhēn yǒng gǎn

她挺身反抗那些恃强欺弱的人，真勇敢。

It is brave of her to stand up to those who use one's strength to bully the weak.

tā shì gè nuò fū zhǐ huì shì qiáng qī ruò

他是个懦夫，只会恃强欺弱。

He's a coward and a bully.