auction off(v.+adv.)
把(财产)拍卖掉get rid of goods by selling at an auction
▲auction sth ⇔ off
He auctioned off his furniture.他把家具拍卖了。
◇ 用于be ～ed结构
It was sad to see all grandmother's lovely things being auctioned off.眼看着祖母那些可爱的东西全都被拍卖掉,心里真不好受。

用作及物动词
▲S+～+n./pron.
He auctioned all his old furniture.他把所有的旧家具都拍卖掉了。

1.auction用作名词时的意思是“拍卖”,可表示拍卖方式或拍卖活动。在表达“拍卖掉某物时”,英国人说sell sth by auction; 而美国人介词多用at。
2.put up for auction表示“拍卖某物”。

We bought these items at an auction.这些物件是我们在一次拍卖时买的。
The house will be sold by auction.这栋房子将要拍卖。
They've put the contents of their house up for auction.他们把房子里的东西全都拿去拍卖了。