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Rule "under cover (undercover)"

This is one of many errors that LanguageTool can detect.

Description: under cover (undercover)
Message: The adjective <suggestion>undercover</suggestion> is spelled as one word if you mean it in the context of "undercover agent".
Category: Grammar (ID: GRAMMAR)
Incorrect sentences
that this rule can detect:
  • He is an under cover agent.
    Correction suggestion: undercover
Correct sentences
for comparison:
  • We advanced under cover of darkness.
  • The tiger salamander (Ambystoma tigrinum) is typical of the frogs and salamanders that hide under cover ready to ambush unwary invertebrates.
  • When it started to rain we got under cover.
  • Store seats under cover before the bad weather sets in.
ID: UNDER_COVER_COMPOUND [1]
Version: 6.8-SNAPSHOT (2025-10-24 22:33:07 +0200)