Knock off and Take a breather

Knock off verb - To bring (as an action or operation) to an immediate end.

Take a breather and knock off are semantically related In some cases you can use "Take a breather" instead a verb "Knock off".

Take a breather verb - Take a short break from one's activities in order to relax.

Knock off and take a breather are semantically related in be or feel at ease topic. Sometimes you can use "Knock off" instead a verb phrase "Take a breather".