décolletage
From Longman Dictionary of Contemporary EnglishRelated topics: Clothes & fashiondécolletagedé‧colle‧tage /ˌdeɪkɒlˈtɑːʒ $ deɪˌkɑːləˈtɑːʒ/ noun [uncountable] DCthe top edge of a woman’s dress that is cut very low to show part of her shoulders and breasts —décolleté /deɪˈkɒlteɪ $ ˌdeɪkɑːləˈteɪ/ adjectiveExamples from the Corpusdécolletage• In an age when décolletage mattered, her shoulders were said to be superb.Origin décolletage (1800-1900) French collet “collar”