noun, plural an·y·bod·ies.
a person of some importance: If you're anybody, you'll receive an invitation.
anybody's guess, a matter of conjecture: It's anybody's guess why she quit.
Origin of anybody
The pronoun anybody is always written as one word: Is anybody home? There isn't anybody in the office. The two-word noun phrase any body means “any group” ( Any body of students will include a few dissidents ) or “any physical body”: The search continued for a week despite the failure to find any body. If the word a can be substituted for any without seriously affecting the meaning, the two-word noun phrase is called for: a body of students; failure to find a body. If the substitution cannot be made, the spelling is anybody. Anybody is less formal than anyone. See also anyone, each, they.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Related Words for anybody's guessquestion
any person; anyone
(usually used with a negative or a question) a person of any importancehe isn't anybody in this town
noun plural -bodies
(often preceded by just) any person at random; no matter who
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
Online Etymology Dictionary, © 2010 Douglas Harper