verb (used with or without object)
Related formsun·slack·ened, adjectiveun·slack·en·ing, adjective
Examples from the Web for slacken
In the 1990s, his pace began to slacken, and eventually the hits evaporated.
The liner began to slacken her speed, and the tugboat soon was alongside.Sinking of the Titanic|Various
The march was resumed after a short delay, and not until two hours had passed did the Indian so much as slacken his pace.The Search for the Silver City|James Otis
Though ordinarily surefooted, Merlin stumbled frequently, and Richard was obliged to slacken his pace.The Lancashire Witches|William Harrison Ainsworth