Definition
When a bank calls in a loan, it requires you to return the money it has provided.
（银行）要求偿还（贷款）
The bank recently started to call in overdue loans.
银行最近开始要求偿还逾期贷款。
He didn’t expect the bank to suddenly call in this loan.
他没想到银行会突然要求偿还这笔贷款。
Once financial conditions worsen, the bank will call in the loan.
一旦金融状况恶化，银行就会要求偿还贷款。