underboob means the lower part of a woman's breast, especially when uncovered or revealed by clothing. Lexicurio rates it Sui generis — a strength score of 89 out of 100.
underboob is pronounced /ˈʌndəbuːb/.
Etymology
From under- + boob.
noun
- The lower part of a woman's breast, especially when uncovered or revealed by clothing.“The banning of the latest FHM cover at New York's Grand Central Station due to its depiction of what is apparently known as an underboob tells us something crucial about the depiction of women in a patriarchal society and its relationship to the commercial marketplace.”