break out in a cold sweat

US /breɪk aʊt ɪn ə koʊld swet/
UK /breɪk aʊt ɪn ə koʊld swet/
"break out in a cold sweat" picture
1.

to suddenly start sweating a lot because you are very frightened or anxious

:
I always break out in a cold sweat when I have to speak in public.
The thought of the exam made him break out in a cold sweat.