1 PHRASAL VERB 殴打;痛打 If someone beats up on a person or beats on them, they hit or kick the person many times. 殴打;痛打 [US] [Also VERB PREPOSITION n]
2 PHRASAL VERB 威胁;恐吓;粗暴对待 If someone beats up on another person, they threaten them or treat them unkindly. 威胁;恐吓;粗暴对待 [US, informal]