a person whose work is selling things at an auction
to sell at an auction
One that conducts an auction.
transitive verbauc·tion·eered, auc·tion·eer·ing, auc·tion·eers
To sell at an auction.
(third-person singular simple present auctioneers, present participle auctioneering, simple past and past participle auctioneered)
From auction + -eer