[nq:1]The idiom "touch and go" sounds like it refers to an occurance, the effect of which is not lasting, but ... usage has been ascribed to a thing marked by uncertainty and peril. [/nq] Brewer's Dictionary of Phrase and Fable defines it as "a very narrow escape" and says that it perhaps derives from driving, when the wheel of one vehicle touches that of another passing vehicle without doing mischief.
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