The term 'slackens' is a verb that means to become less strict or intense. The crossword solutions for this term are EBBS (4 letters), ABATES (6 letters), LESSENS (7 letters), EASES (5 letters), SAGS (4 letters), LETSUP (6 letters), EASESUP (7 letters), RELAXES (7 letters), and RELENTS (7 letters). Each of these words has a similar meaning to slackens, with EBBS meaning to gradually diminish, ABATES meaning to reduce in intensity, LESSENS meaning to make smaller, EASES meaning to make less difficult, SAGS meaning to droop or weaken, LETSUP meaning to become less strict, EASESUP meaning to become less severe, RELAXES meaning to become less tense, and RELENTS meaning to give in or yield.