-su Godan/u-verb

1. to repair; to mend; to fix; to correct (a mistake, bad habit, etc.); to put right; to restore; to straighten (e.g. a tie); to tidy up (one's hair, make-up, etc.); to revive (one's spirits)
2. to change; to alter; to convert; to translate
3. ksb to put back; to put away
4. to cure; to heal (usu. written as 治す)
5. dated to move up; to promote

suffix

6. to do over again; to redo (after -masu stem of verb)