cat got your tongue可不是你舌头被猫咬了，而是你怎么不说话了；哑口无言；无言以对。

【例句】
Has the cat got your tongue? You haven't called me in days!
你怎么不说话？你好多天都没打电话给我了。

So, why are you late again, Jessie? I'll bet you're running out of excuses. What's the matter-oh, cat got your tongue?
怎么又迟到了？我猜你的借口不多了吧？怎么了？怎么不说话了？