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)
尻隠し is read as しりかくし (shirikakushi) and means back pocket.
しりかくし
shirikakushi
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)