Antonyms of verb unscrew

1 of 2 senses of unscrew

Sense 2
unscrew -- (loosen by turning; "unscrew the bottle cap")
       Antonym of screw (Sense 4)
      => screw -- (tighten or fasten by means of screwing motions; "Screw the bottle cap on")

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

2 senses of unscrew

Sense 1
unscrew -- (loosen something by unscrewing it; "unscrew the outlet plate")
       => loosen, loose -- (make loose or looser; "loosen the tension on a rope")

Sense 2
unscrew -- (loosen by turning; "unscrew the bottle cap")
       => loosen, loose -- (make loose or looser; "loosen the tension on a rope")