Her sudden withdrawal from the championship caused a lot of press speculation about her health.

withdrawal 是动词 withdraw 的名词形式。withdraw 由前缀 with-（表示"向后"）和 draw（"拉"）组成，字面意思是"向后拉"，引申为"退出、撤回"。 withdrawal 指"退出、撤回"的行为或状态，在这里特指从比赛中退出。