freeze up
verb- To be adversely affected by ice, and not function.
- (of machines and software) To come or bring to a sudden halt, stop working (functioning). · Since the last update, the program freezes up after a few minutes of use.
- (of people and other animals) To stop or be stopped due to attentiveness, fear, surprise, etc. · Despite all of the rehearsals, as soon as I got on stage I froze up.
- To become cold and formal in demeanour.
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