瞎猫碰上死耗子

瞎猫碰上死耗子

Literally means:

blind cat runs into a dead mouse

Actually means:

sheer coincidence

耗子 refers to mouse.

It figuratively means one accomplishes something by fluke.

It is sometimes used to show one's modesty or to indicate that one does not feel convinced by others' achievements. Slightly derogatory in the latter sense

耗子，老鼠。

瞎猫碰上死耗子，瞎了眼的猫逮到了死老鼠。

比喻做成某事完全是侥幸或碰巧。有时用于自谦，有时用来表示对别人的成绩不服气。用于后一种意思时略含贬义。