show who's boss (third-person singular simple present shows who's boss, present participle showing who's boss, simple past showed who's boss, past participle shown who's boss)
(intransitive, idiomatic) To demonstrate oneself to be dominant; to show that one has the upper hand.
(transitive, idiomatic) To demonstrate that one is dominant over or superior to someone; to establish that one has control of some device or intractable object.