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write out

write out idiom

Express in writing, especially in full form. For example, Write out your request on this form, or No abbreviations allowed; you have to write everything out. [Mid-1500s]
write oneself out. Exhaust one's energies or abilities by writing too much, as in He's been doing a novel a year for ages, but now he's written himself out. [Early 1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.