汗をかく

Etymology
From 🇰🇲.

Verb

 * 1)  to sweat
 * 2) cold sweat
 * 3) formation of moisture due to condensation of water vapor
 * 4)  to work hard, to spare no effort
 * 1)  to work hard, to spare no effort
 * 1)  to work hard, to spare no effort