ratchet - definition and synonyms

verb [intransitive/transitive] 

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/ˈrætʃɪt/
present tense
I/you/we/theyratchet
he/she/itratchets
present participleratcheting
past tenseratcheted
past participleratcheted
  1. to increase or decrease by small amounts during a period of time, or to make something do this

    We are taking steps to ratchet up our profit margin.