noun. ['ˈslækənɪŋ'] an occurrence of control or strength weakening.
1. Noun, singular or mass These instruments have winch-like mechanisms which allow the strings to be wound tightly with the simple turn of a knob and which then hold the added tension, preventing slackening. 2. Verb, gerund or present participle Spring scales can, unfortunately be subject to slackening as the spring is used routinely over long period of time.