be like a deer caught in the headlights
US /bi laɪk ə dɪr kɔt ɪn ðə ˈhɛdˌlaɪts/
UK /bi laɪk ə dɪr kɔt ɪn ðə ˈhɛdˌlaɪts/
1.
to be so surprised or frightened that you cannot move or think
:
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When the teacher asked him a question, he just stood there like a deer caught in the headlights.
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She was so shocked by the news that she just froze, like a deer caught in the headlights.