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Rule "on off (on-off)"

This is one of many errors that LanguageTool can detect.

Description: on off (on-off)
Message: The adjective <suggestion>\1-\2</suggestion> is spelled with a hyphen.
Category: Compounding (ID: COMPOUNDING)
Link: https://www.merriam-webster.com/dictionary/on-off
Incorrect sentences
that this rule can detect:
  • Tom and Mary are having an on off relationship.
    Correction suggestion: on-off
ID: ON_OFF_HYPHEN [1]
Version: 6.6-SNAPSHOT (2024-11-22 22:33:09 +0100)