Deposited on the shore - or on the rocks (6,2)

I believe the answer is:

washed up

I'm a little stuck... Click here to teach me more about this clue!

'deposited' is the definition.
Although both the answer and definition are past participle verbs, I can't understand how they can define each other.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for washed up that I've seen before include "Did kitchen duty" , "Thrown on shore; did dishes" , "Defeated or failed - left on shore? (6, 2)" , "Done for - cleaned dishes" , "Defeated, failed - or cleaned dishes" .)

I've seen this clue in The Irish News and The Globe and Mail.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.