What does it mean in books when they say "His/Her Eyes widened?"
Like does it mean they are mad or are they exited?
"Eyes widened" may show that someone is surprised, shocked or excited. When someone opens his/her eyes wide without blinking and with an immobile face, this is an indication of domination, aggression as well as use of power.
Exited or suprised usually
Usually excited, surprised, or shocked.