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drop-down
drop-down adj.
Brit. 
/ˈdrɒpdaʊn/
, /ˈdrɒpdaʊn/U.S. /ˈdrɑpˌdaʊn/
designed to drop or let down (see also quot. drop- comb. form)./ˈdrɑpˌdaʊn/ΚΠ
1934 H. Addison Text Bk. Appl. Hydraulics viii. 137 (heading) Falling surface or drop-down curves.
1940 Chambers's Techn. Dict. 267/2 Drop-down curve (Hyd. Eng.), the longitudinal profile of the water surface in the case of non-uniform flow in an open channel, when the water surface is not parallel to the invert.
1951 Festival of Brit.: Catal. Exhibits: South Bank Exhib. (H.M.S.O.) 36/2 Gas cooker..with drop-down door.
drop-down
drop-down adj.
Brit. /ˈdrɒpdaʊn/
, /ˈdrɒpdaʊn/U.S. /ˈdrɑpˌdaʊn/
Computing (in a graphical user interface) designating a menu or list that appears underneath an element when the element is selected, esp. one that remains on display without having to be kept in position by the user; cf. pull-down adj. 2./ˈdrɑpˌdaʊn/ΚΠ
1984 InfoWorld 7 May 15/3 The 2.0 updated series of software will have features such as drop-down menus and commands on screen.
1995 Computer Weekly 10 Aug. 39/6 Useful too is the list of 100 new files at each site (available as a drop down list from the main page).
2005 Digital Photographer No. 31. 89/3 Use the drop-down menu to select the banner option.
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