forslack

To slack up; be or grow slack; pall.

To be slack in; neglect by idleness; relax; render slack; delay; lose or spoil by slackness.

But they were virgins all, and love eschewed / That might forslack the charge to them fore-shewd.

The official thinking to foreslacke no time, taking counsell with his fellowes, laide hands uppon this Peter, and brought him before the inquisitor.