bid-up

[bid-uhp]
noun
  1. the act or an instance of increasing the price of something by forcing the bidding upward.
  2. the amount of such increase: a bid-up of 100 percent in the last year.

Origin of bid-up

First recorded in 1860–65; noun use of verb phrase bid up
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018