Explanation: to work very hard

 Idioms:

1)       To sweat blood.

Буквален превод: да отделяш кървава пот

2)       By the sweat of one's brow

Буквален превод: с пот по веждите/ на челото

3)       To work your fingers to the bone.

Буквален превод: да изтъркаш пръстите си до кост от работа

Examples:

I really sweated blood this week but I finished the project before the deadline.

They managed to save their family business by the sweat of their bones/ working their fingers to bone.