slacken off
Let up gradually
To slacken off is to reduce effort, intensity, or pace—becoming less diligent or active: Production slackened off toward the end of the quarter.
It can describe declining demand, easing tension, or simply letting up: The rain finally slackened off around noon.
Often used when someone stops working as hard as they should.
ease
Lack of strain
lessen · subside · wane · ebb · decline · dwindle · abate · fade · taper · drop
intensity/effort
slacken offintensify
Increase in degree
step up · redouble · ramp up · buckle down · double down
speed/pace
slacken offspeed up
Increase velocity or rate
accelerate · pick up · quicken · hasten · gather pace
slack, slacken, slacker, slackness, slackly, slacks, slacked, slacking, off