to wash your whole body while standing under a shower:
Mike shaved and showered.
to give someone a lot of things
shower somebody with something
She showered him with kisses.
Tom showered Amy with presents.
shower something on/upon somebody
She had no children and showered her love on her three nieces.
3 [intransitive always + adverb/preposition, transitive]
to scatter a lot of things onto a person or place, or to be scattered in this way
The top shelf broke and books showered down.
shower something with something
The ship was showered with hot ash from the volcano.
shower something on/over something
Hundreds of leaflets were showered over the town.