“无薪假”常见的英文表达是 “unpaid leave” 。
例如：
He has applied for unpaid leave to take care of his sick father.（他已申请无薪假去照顾生病的父亲。 ）
The company allows employees to take unpaid leave for personal reasons.（公司允许员工因个人原因请无薪假。 ）