lengthening reaction
noun
length·en·ing reaction
ˈleŋ(k)th-(ə-)niŋ-, ˈlen(t)th- 
: reflex relaxation of a muscle when it is subjected to excessive and vigorous stretching
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“Lengthening reaction.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/lengthening%20reaction. Accessed 31 Oct. 2025.
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