sweat

1 sweat /ˈswɛt/ verb
sweats; sweat or sweated; sweating
1 sweat
/ˈswɛt/
verb
sweats; sweat or sweated; sweating
Britannica Dictionary definition of SWEAT
1 
[no object] : to produce a clear liquid from your skin when you are hot or nervous
2 
[no object] informal : to work very hard
— often + over
3 
informal
a  : to feel worried or nervous about something
[no object]
— often + over
[+ object]
b  [no object] : to go through an experience that causes a lot of emotional stress or worry — usually + through
c  [+ object] US : to worry or be nervous about (something)
4 
[no object] : to produce small drops of liquid on the surface
5 
[+ object] chiefly British : to cook (something) slowly in a covered pan with a little fat

sweat blood

— see blood

sweat bullets

US, informal
: to be very nervous or worried

sweat off

[phrasal verb]
sweat off (something) or sweat (something) off
: to lose (an amount of weight) by sweating (especially by exercising a lot)

sweat out

[phrasal verb]
1 
sweat out (something) or sweat (something) out informal
: to wait nervously until the end of (something)
2 
US
a  : to work hard at (something)
b  : to get or achieve (something, such as a victory) by working very hard
3 
: to end (an illness) by exercising and sweating
2 sweat /ˈswɛt/ noun
2 sweat
/ˈswɛt/
noun
Britannica Dictionary definition of SWEAT
1 
[noncount] : the clear liquid that forms on your skin when you are hot or nervous : perspiration
2 
[count] : the state or condition of someone who is sweating — usually singular
— see also cold sweat
3 
[noncount] : hard work
4 
[noncount] : moisture that forms in drops on a surface

break a sweat

(US) or British break sweat
: to begin to sweat
— often used figuratively to say that something is not hard for someone to do

by the sweat of your brow

: by doing hard, physical work

in a sweat

informal
: very nervous or worried about something

no sweat

informal
: with little or no difficulty : easily