whole face; all over one's face
Describes something covering or affecting the entire face. Often used adverbially.
彼は顔中に泥がついていた。
He had mud all over his face.
嬉しくて顔中がほころんだ。
My whole face broke into a smile from happiness.
Compound of 顔 (kao, 'face') and 中 (jū, 'throughout, all over').