I want to find some English phrases whose individual words are seldom used outside of that phrase. That way its words show up in the phrase alone, but nowhere else.
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How about "to boot," in the sense of "in addition" in occasionally used phrases like "... and I'll throw this in to boot?" In American English the only other use of the word, which is an Anglo Saxon word meaning profit or advantage, not the French word for shoe, is in reference to an additional amount needed to complete a tax free exchange of real property.