a prefixal use of out, adv., occurring in various senses in compounds (outcast, outcome, outside), and serving also to form many transitive verbs denoting a going beyond, surpassing, or outdoing in the particular action indicated (outbid, outdo, outgeneral, outlast, outstay, outrate).
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Origin of out-
Middle English; Old English ūt-; see out
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for out-
excelling or surpassing in a particular actionoutlast; outlive
indicating an external location or situation away from the centreoutpost; outpatient
indicating emergence, an issuing forth, etcoutcrop; outgrowth
indicating the result of an actionoutcome
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012