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Wiktionary
write off

vb. 1 (context accounting English) To reduce an asset's book value to zero 2 (context accounting English) To record an expenditure as an expense. 3 (context accounting English) To remove a portion of a debt or an amount of an account owed to you counting it as a loss (as a gesture of goodwill for example) 4 (context accounting English) To record a notional expense such as amortization or depreciation. 5 Figuratively, to assign a low value to something.

WordNet
write off
  1. v. concede the loss or worthlessness of something or somebody; "write it off as a loss"

  2. write something fluently, and without hesitation

  3. cancel (a debt)

  4. reduce the estimated value of something; "For tax purposes you can write off the laser printer" [syn: write down]