slå av

Etymology
From combinations of different senses of the verb and. The fourth sense is derived from.

Verb

 * 1)  to strike so that it falls off
 * 2)  to indulge in (an activity)
 * 3)  to turn off
 * 4)  to reduce (e.g. a price or debt or other sum of money)
 * 5)  to fire (e.g. a volley)
 * 1)  to fire (e.g. a volley)

Verb

 * 1) to turn off
 * 2)  to strike (something) so that it falls off or breaks
 * 3)  to reduce (often a price or the like)
 * 1)  to strike (something) so that it falls off or breaks
 * 2)  to reduce (often a price or the like)
 * 1)  to reduce (often a price or the like)
 * 1)  to reduce (often a price or the like)