To pour or throw (something) onto someone; to shower someone with (e.g., water, accusations, praise).
彼はバケツの水を友達に浴びせた。
He poured the bucket of water over his friend.
記者たちは彼に批判を浴びせた。
Reporters showered him with criticisms.
子どもたちはプールでお互いに水を浴びせて遊んだ。
The children played by splashing water on each other in the pool.