BIDDER

• Auction attendee

• Auction participant

• Bridge player, at times

• Car-auction participant

• eBay customer

• eBay user, perhaps

• Nodding one, sometimes

• North, perhaps

• One in action at an auction

• Paddle holder at an auction

• Sotheby's patron

• Sotheby's visitor

• Someone who makes an offer

• Someone who makes a bid at cards