白日里见鬼

板上钉钉

Literally means:

see ghosts in broad daylight

Actually means:

Chinese people believe that ghosts do not appear in daytime. So if one sees ghosts in daytime, it is very strange or unlucky. It figuratively means encountering something strange, unpleasant or undesired. Derogatory.

中国人认为鬼是不会在白天出现的，如果在白天看到鬼，那是特别倒霉、奇怪的事。比喻遇到了奇怪、不顺心或倒霉的事。多含贬义。