From Longman Dictionary of Contemporary Englishdécolletagedé‧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/ adjective
Examples from the Corpus
décolletage• In an age when décolletage mattered, her shoulders were said to be superb.Origin décolletage (1800-1900) French collet “collar” 