slacken
verb
[ ˈslak(ə)n ]
• make or become slack.
• "he slackened his grip"
• reduce or decrease in speed or intensity.
• "the pace never slackens"
Similar:
become/get/make slower,
slow down,
slow,
decelerate,
reduce in speed,
slack,
decrease,
lessen,
subside,
ease up/off,
get less,
let up,
abate,
moderate,
become less intense,
slack off,
diminish,
dwindle,
die down,
fall off,
drop off,
taper off,
ebb,
recede,
wane,