During the team meeting, she suddenly brought up my past mistakes, which was clearly cheap shot.

cheap 本义是"便宜的"，引申为"低劣的、卑鄙的"。 shot 本义是"射击"，引申为"尝试、攻击"。 cheap shot 指"卑鄙的攻击"或"恶意中伤"，特指在对方无法防备时进行的言语或行为攻击。