What type of figurative language is "until memory comes rushing over you like a wave"?

The answer would be simile.

Explanation:

The sentence is comparing you remembering something to a wave rushing over you. This means it could be a metaphor or a simile, but if you look you will see that is says the word like.

Similes compare stuff with the words like or as, while a metaphor does not use the words like or as to compare stuff.

Sounds like a metaphor. Seeming to mean that it comes quickly and hits you hard