slacken

verbs

become slow or slower

"Production slowed"

slack, slacken, slow, slow down, slow up

make less active or fast

"He slackened his pace as he got tired"; "Don't relax your efforts now"

relax, slack, slack up, slacken

become looser or slack

"the rope slackened"

slacken

see also

is a type of (narrower)

become weaker

"The prisoner's resistance weakened after seven days"

make slack as by lessening tension or firmness

remit, slacken

is derived from