Here's what we found for "Retract a bid"
If there are 12 or more hours remaining on an auction, you may be able to retract your bid in the following situations:
You made a mistake when you placed your bid, such as entering $50 instead of $5
The item description changed significantly after you placed your bid
You're unable to contact the seller
If you want to retract your bid for any other reason or there’s less than 12 hours remaining on an auction, you’ll need to contact the seller to ask if you can retract your bid. The seller must cancel the bid on your behalf.