original meaning of ‘blue sky and hot air’

U.S., 1903—originally used in the sense of ‘impractical scheme based on empty talk’, the element ‘blue sky’ meaning ‘unrealistic project’, and ‘hot air’ meaning ‘insubstantial claims’

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How ‘blue Monday’ came to denote a gloomy Monday.

A calque of German ‘blauer Montag’, ‘blue Monday’ originally denoted a Monday on which people chose not to work as a result of excessive indulgence over the course of the weekend. Under the influence of the adjective ‘blue’ in the sense ‘dismal’, it came to denote a Monday that is depressing or trying.

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origin of ‘red tape’ (obstructive official rules)

The noun red tape, meaning excessive bureaucracy or adherence to official rules and formalities, refers to the use of woven red tape to tie up bundles of legal documents and official papers; the literal meaning is first recorded in 1658, the figurative meaning in 1736.

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The literal meaning of ‘cappuccino’ is ‘Capuchin’.

USA, 1948—espresso coffee mixed with steamed milk—borrowed from Italian ‘cappuccino’, literally ‘Capuchin’, because the colour of this type of coffee resembles that of a Capuchin’s habit—cf. French ‘capucin’ (= ‘Capuchin’), a name for the hare, from the colour of the animal’s fur

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