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A writing term inspired by the phrase "under the knife". 'Under the pen' is a phrase in writing (particularly in Hollywood screenwriting) to mean that an already completed work is currently undergoing revisions by the writer.
JUSTIN: "Hey, Alex, how's that screenplay of yours you sold last year to that big studio?"

ALEX: "Well, that big studio wants some revisions made, so it's under the pen right now."
by Justin Alex April 20, 2010
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