it's written all over (one's) face(redirected from it is written all over their faces)
it's written all over (one's) face
One's emotions or inner thoughts are evident by one's facial expression. I know you're actually terrified to go into the haunted house, Jenny—it's written all over your face!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
It's written all over one's face.
Fig. It is very evident and can easily be detected when looking at someone's face. I know she's guilty. It's written all over her face.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.