Definition
to have a negative impact on someone or something, increasing the chances of failure
对某人或某事不利；对其有负面影响
Arriving late for the interview will count against you.
面试迟到会对你不利。
Her absence will count against the team's overall performance.
她的缺席将对团队的整体表现不利。
The failing grade on this exam will count against his college applications.
这次考试不及格将对他的大学申请不利。