bos·om (bo?oz??m, bo?o?z?m)n.1. a. The chest of a human: He held the sleepy child to his bosom.b. A woman’s breast or breasts.2. The part of a garment covering the chest or breasts.3. The security and closeness likened to being held in a warm familial embrace: We welcomed the stranger into the bosom of our family.4. The chest considered as the source of emotion.adj. Beloved; intimate: a bosom friend.[Middle English, from Old English b?sm.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.bosom (?b?z?m) n1. (Anatomy) the chest or breast of a person, esp the female breasts2. (Clothing & Fashion) the part of a woman’s dress, coat, etc, that covers the chest3. a protective centre or part: the bosom of the family. 4. the breast considered as the seat of emotions5. (modifier) very dear; intimate: a bosom friend. vb (tr) 6. to embrace7. to conceal or carry in the bosom[Old English b?sm; related to Old High German buosam]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014bos?om (?b?z ?m, ?bu z?m) n. 1. the breast of a human being: The father held the baby to his bosom. 2. the breasts of a woman. 3. the part of a garment that covers the breast. 4. the breast, conceived of as the center of feelings or emotions: Anger lay in her bosom. 5. something likened to the human breast: the bosom of the earth. 6. a state of enclosing intimacy: the bosom of the family. adj. 7. intimate: a bosom friend. v.t. 8. to take to the bosom. 9. to conceal. [before 1000; Middle English; Old English b?s(u)m] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.breast – bust – bosom1. ‘breast’A woman’s breasts are the two soft, round pieces of flesh on her chest that can produce milk to feed a baby.A woman’s breasts can be referred to as her bust, especially when you are talking about their size. Note that bust refers to both breasts together. You do not talk about a woman’s ‘busts’.Bust is also used to talk about the measurement around the top part of a woman’s body at the level of her breasts.A woman’s breasts can also be referred to as her bosom /’b?z?m/. This is an old-fashioned or literary word.