Synonyms of slacken in English:

slacken


See definition of slacken

verb

1‘he slackened his grip’

SYNONYMS
loosen, make looser, release, relax, loose
lessen, reduce, weaken
dated veer
ANTONYMS

tighten

2‘her footsteps slackened’

SYNONYMS
become slower, get slower, make slower, slow down, slow, decelerate, reduce in speed, slack
ANTONYMS

speed up, quicken

3‘I think the rain might just be slackening’

SYNONYMS
decrease, lessen, subside, ease off, ease up, get less, let up, abate, moderate, become less intense, slack off, diminish, dwindle, die down, fall off, drop off, taper off, ebb, recede, wane