頭隠して尻隠さず (あたまかくしてしりかくさず): burying one's head in the sand (while leaving other parts of one's body exposed); exposing one's weak point while attempting to protect oneself; hiding one's head without hiding one's bottom

burying one's head in the sand (while leaving other parts of one's body exposed); exposing one's weak point while attempting to protect oneself; hiding one's head without hiding one's bottom

For someone who thinks they have covered up what everyone can plainly see.

A Japanese proverb (ことわざ)