sweat bullets

blood, sweat and tears

A person's determination and hard work.

break a sweat

To put effort into something.

don't sweat it

Do not worry about it.

sweat bricks

Synonym of sweat bullets (“to sweat profusely”).

sweat equity

An investment of labour, typically by the owner and often his or her family, usually in a small business or personal residence that increases the value of the business or residence.

sweat of one's brow

The effort extended in (often manual) labour, and the value created thereby.

sweat the small stuff

To worry about petty issues or insignificant matters.