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slacken

slack·en [ slákən ] (past and past participle slack·ened, present participle slack·en·ing, 3rd person present singular slack·ens)


transitive and intransitive verb 
Definition:
 
1. make or become slower or quieter: to become less intense, vigorous, or fast, or make something become less intense, vigorous, or fast

2. loosen or relax: to become looser or more relaxed, or make something become looser or more relaxed

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