Knuckle down and Set-to

Knuckle down verb - Work very hard, like a slave.

Set-to and knuckle down are semantically related. In some cases you can replace phrase "Set-to" with "Knuckle down", this terms are similar.

Set-to noun - An often noisy or angry expression of differing opinions.

Knuckle down and set-to are semantically related. Sometimes you can use "Knuckle down" instead a verb phrase "Set-to".