We found one dictionary that defines the word sail under false colours:

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1. sail under false colours: Idioms

▸ Words similar to sail under false colours ▸ Usage examples for sail under false colours ▸ Idioms related to sail under false colours ▸ Wikipedia articles (New!) ▸ Words that often appear near sail under false colours ▸ Rhymes of sail under false colours ▸ Invented words related to sail under false colours