有个三长两短

有个三长两短:

Literally means:

there are three long and two short

Actually means:

Unexpected misfortune or calamity falls upon someone.

It not only implies that such a disaster or accident may cause death, but also connotes the speaker's worry and agitation about the possible mortality. This phrase seldom applies to children.

指发生或遇到灾祸或事故。

常用来暗示有生命危险，或者灾祸可能造成人身死亡，并表示说话人对死亡事故的担心。这样的话一般不适用于孩子。