toss in the sponge → τα παρατάω, καταθέτω τα όπλα, εγκαταλείπω, την κάνω, φεύγω, σηκώνω τα χέρια ψηλά, αποχωρώ, τα βροντάω, την κάνω μ' ελαφρά, δίνω τέλος, δίνω οριστικό τέλος

[spiros]

toss in the sponge → τα παρατάω, καταθέτω τα όπλα, εγκαταλείπω, την κάνω, φεύγω

throw in the towel and throw in the sponge; toss in the sponge
Fig. (From boxing, where this is done by a boxer's trainer to stop the fight.) to signal that one is going to quit; to quit. When John could stand no more of Mary's bad temper, he threw in the towel and left. Don't give up now! It's too soon to throw in the sponge.
http://idioms.thefreedictionary.com/throw+in+the+towel

How to know when your marriage is over
There are signs a relationship is in trouble, but knowing when to throw in the towel is hard
http://finance.yahoo.com/news/just-another-fight-over-040100241.html

[crystal]

σηκώνω τα χέρια ψηλά, αποχωρώ, τα βροντάω, την κάνω μ' ελαφρά, δίνω τέλος, δίνω οριστικό τέλος