What does the 'deer in headlights' look mean?

I saw my crush in the hallway (we'd seen each other there before) and he just stared at me with this scared deer in headlights look. Please explain?

p. s. we're not really friends so I wasn't expecting a hello but before when I'd seen him we either simply made brief eye contact or just passed by each other without anything
What does the 'deer in headlights' look mean?
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