欺负 qīfu to bully

How to remember 欺负: 欺 to cheat + 负 shoulder = to bully.

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To bully, pick on, take advantage of someone weaker - 别欺负人 (bié qīfu rén) don't bully people, 他被同学欺负 he's bullied by classmates.
Everyday spoken; 负 is neutral tone (qīfu). Covers physical bullying and unfair treatment/exploitation.
Contrast 欺骗 (qīpiàn, to deceive): 欺负 is about mistreating/oppressing, not lying to.