slacken - Dictionary definition and meaning for word slacken
relate slacken with weaken... a weak person generally slows down in pace due to weakness.
s+lack+en lack energy .a person who lacks energy will slow up
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bracken looses his energy ......later on
Slacken,Slack: S(Stiffness)+Lack : lack of Stiffness i.e weak,loose,...person/thing...etc