He asked her to pledge the house as security for a loan.

他要她抵押房子作为贷款担保。

《柯林斯英汉双解大词典》

His home and business are being held as security for the loan.

他是以房子和店铺为抵押得到这笔贷款的。

《牛津词典》

The real purpose of this new property loan policy is to boost credit support for building an a ordable housing system for social security purposes.

新的房地产贷款政策目的在于为建立社会住房保障体系提供信贷支持，从而促进社会的稳定。

youdao

The item itself acts as the security or collateral for the loan.

VOA: special.2011.04.18

Because over the course of a year, there is a danger that the bank that you've borrowed from - and is holding your assets as security for the loan - could go bust.

BBC: Where to find bank stress

But if the money were to come from the EFSF, well in those circumstances Finland has said it would fear that the money would be too much at risk of loss - so it is demanding collateral or security for its share of any such loan.

BBC: Messy Spanish rescue

"It appears that we are talking about a lone individual who came to the bank in the morning hours, sought cover for a debt, a loan, and did not get it, " said Internal Security Minister Yitzhak Aharonovitch.

BBC: Israel bank shooting leaves four dead