0 past simple and past participle of slack --
1 to work more slowly and with less effort than usual, or to go more slowly: --
As the former arbitration took much time, the naval arms race, though it slacked during the time of eased tension which came with the agreements, continued.
He slacked off in his studies and had to resort to bribery just to graduate.
One is tensioned and the other is slacked off to move the tongs.
As the clewlines were hauled in, the sheets would be slacked off.
After 1880 immigration slacked off and growth was due chiefly to the excess of births over deaths.
His writing slacked off between 1915 and 1939, then picked up again.
It is not the familiar allegation so often inaccurately made that delivery to time was impossible because workers had slacked.
Punishments were also meted out for workers who may have slacked off five minutes before work was over.
