HackerVoca

: rule, govern, prevail, predominate (Ant) obey
reinforce : strengthen, intensify
rejoice : delight
relation : connection, relationship, association, alliance
relax : loosen, slacken / / also slacken off verb [intransitive, transitive]

1 to gradually become slower, weaker, less active etc, or to make something do this: The heavy rain showed no signs of slackening off. | slacken your pace/speed (=go or walk more slowly): Once outside the gates, I slackened my pace.

2 to make something looser or to become looser: Just slacken the screws a little.

tighten
(Ant) tighten, intensify