slacken

Here was no two-miles plod back again over the burning asphalt, slackening every nerve that had been braced up by the bathe.

In the meantime, the speed was slackening, and by and by the harsh tolling of the locomotive bell echoed among the pines.

Scarcely slackening his pace he started up the long road by the hill.

After a time the animals seemed to him to be slackening their speed.