write off
write off {v. phr.}
1. To remove (an amount) from a business record; cancel (a debt); accept as a loss.
If a customer dies when he owes the store money, the store must often write it off.
Compare: CHARGE OFF.
2. To accept (a loss or trouble) and not worry anymore about it; forget.
Mr. Brown had so much trouble with the new TV set that he finally wrote it off and bought a new one.
Jim's mistake cost him time and money, but he wrote it off to experience.
Compare: CHARGE OFF (2).
Contrast: CHALK UP (2). To say that (something) will fail or not be good; believe worthless.
Just because the boys on the team are young, don't write the team off.
Compare: COUNT OUT.
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Source: A Dictionary of American Idioms