BOTTOM FALL OUT

{v. phr.} {informal} 1. To fall below an earlier lowest price. * /The bottom dropped out of the price of peaches./ 2. To lose all cheerful qualities; become very unhappy, cheerless, or unpleasant. * /The bottom dropped out of the day for John when he saw his report card./ * /The bottom fell out for us when the same ended with our team on the two yard line and six points behind./