Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb tighten_up

1 sense of tighten up

Sense 1
stiffen, tighten, tighten up, constrain -- (restrict; "Tighten the rules"; "stiffen the regulations")
       => restrict, restrain, trammel, limit, bound, confine, throttle -- (place limits on (extent or access); "restrict the use of this parking lot"; "limit the time you can spend with your friends")