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Rule "overnight instead of 'over night'"

This is one of many errors that LanguageTool can detect.

Description: overnight instead of 'over night'
Message: Did you mean the verb, adjective or adverb <suggestion>\1\2</suggestion> (i.e., for or during the entire night)?
Category: Commonly Confused Words (ID: CONFUSED_WORDS)
Link: http://www.merriam-webster.com/dictionary/overnight
Incorrect sentences
that this rule can detect:
  • She stayed over night.
    Correction suggestion: overnight
  • The stock has gone down over night.
    Correction suggestion: overnight
  • He over nighted at my house.
    Correction suggestion: overnighted
Correct sentences
for comparison:
  • Cover and refrigerate overnight.
  • I prefer day over night.
ID: OVERNIGHT [1]
Version: 6.8-SNAPSHOT (2025-10-28 22:33:08 +0100)