surcharge

Short definition from Wiktionary

Noun

1. 1
   An addition of extra charge on the agreed, stated, or baseline price.
2. 2
   The part of the price of a subsidized good or service that is not covered by the subsidy and so must be paid by the consumer.
3. 3
   An excessive price charged e.g. to an unsuspecting customer.
4. 4
   An overprint on a stamp that alters (usually raises) the original nominal value of the stamp; used especially in times of hyperinflation.
5. 5
   A painting in lighter enamel over a darker one that serves as the ground.
6. 6
   A charge that has been omitted from an account as payment of a credit to the charged party
7. 7
   A penalty for failure to exercise common prudence and skill in the performance of a fiduciary's duties.
8. 8
   An excessive load or burden.
9. 9
   The putting, by a commoner, of more animals on the common than he is entitled to.

Verb

1. 1
   To apply a surcharge.
2. 2
   To overload; to overburden.
3. 3
   To overstock; especially, to put more cattle into (e.g. a common) than one has a right to do, or more than the herbage will sustain.
4. 4
   To show an omission in (an account) for which credit ought to have been given.