Meaning of “go after sb” - Learner’s Dictionary

go after sb

phrasal verb with go uk us /ɡəʊ/ verb [ I ] (present participle going, past tense went, past participle gone)

to chase or follow someone in order to catch them:

He ran away, but the police went after him.

(Definition of “go after sb” from the Cambridge Learner’s Dictionary © Cambridge University Press)