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Verb: frighten off  frI-t(u)n óf
  1. Cause to flee, depart or back off through fear or intimidation
    "frightened off by the refusal";
    - scare off, scare away, frighten away, scare

Derived forms: frightens off, frightened off, frightening off

Type of: intimidate, put the frighteners on [Brit, informal], put the screws on [informal]