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The origin of cross-language idioms is uncertain. One theory is that cross-language idioms are a language contact phenomenon, resulting from a word-for-word translation called a calque. Piirainen says that may happen as a result of lingua franca usage in which speakers incorporate expressions from their own native tongue, which exposes them to speakers of other languages. Other theories suggest they come from a shared ancestor-language or that humans are naturally predisposed to develop certain metaphors.[citation needed]