‘trigger-happy’: meaning and origin

USA, 1942—over-ready to shoot at anything at any time or on slight provocation—during and following WWII, ‘happy’ was used as the second element in compound adjectives relating to mental instability associated with the first element

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‘armchair’ (attributive modifier)

The noun ‘armchair’ is used as an attributive modifier meaning: 1) based or taking place in the home as opposed to the world or environment outside; hence, chiefly depreciatively: 2) lacking or not involving practical or direct experience of a particular subject or activity.

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