A large withdrawal from her savings account triggered a security alert.

withdrawal 是动词 withdraw 的名词形式，withdraw 由前缀 with-（表示"向后、离开"）和 draw（"拉、取"）组成，字面意思是"向后拉走"。 在金融领域，withdrawal 特指"从银行账户中取出资金"的行为，即"取款"。