Read their thoughts - Idioms by The Free Dictionary
read (one's) thoughts (redirected from read their thoughts)
read (one's) thoughts
To know or infer what one is thinking. You read my thoughts—that's exactly where I want to go to dinner! I'm sorry, but I can't read your thoughts. You need to tell me these things.
ˌread somebody’s ˈmind/ˈthoughts (informal) understand what somebody is thinking, feeling, planning, etc: I can’t read your mind! If you don’t tell me what’s worrying you, I can’t help you.