push the envelope
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Exceed the limits of what is normally done, be innovative, as in They are pushing the envelope in using only new fabrics for winter clothing. This idiom comes from aviation, the envelope alluding to the technical limits of a plane's performance, which, on a graph, appear as a rising slope as limits of speed and stress are approached and falls off when the capacity is exceeded and the pilot loses control; safety lies within these limits, or envelope, and exceeding them exposes pilot and plane to risk. [Slang; late 1960s]
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Words nearby push the envelope
push-pull, pushrod, push shot, push someone's buttons, push-start, push the envelope, push the panic button, push through, Pushto, Pushtu, push-up
The American Heritage® Idioms Dictionary
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