■ noun
1》 an additional charge or payment.
↘ Brit. an amount in an official account not passed by the auditor and having to be refunded by the person responsible.
↘the showing of an omission in an account for which credit should have been given.
2》 a mark printed on a postage stamp changing its value.
■ verb
1》 exact a ~ from.
2》 mark (a postage stamp) with a ~.