‘to think outside the box’: meaning and origin

USA, 1971—to think creatively or in an unconventional manner—originated in a puzzle in which the aim is to connect nine dots arranged in the form of a square with four consecutive straight lines: the puzzle can be solved only by extending three of the lines outside the box implied by the arrangement of the dots

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‘to go ballistic’: meanings and origin

1980s—to become wildly or explosively angry; to become highly excited or enthusiastic; to intensify rapidly and especially alarmingly—refers to the failure of a guided missile’s guidance system (1966)

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‘tickety-boo’: meaning, early occurrences and origin

UK, 1938—old-fashioned informal British-English adjective meaning ‘in good order’, ‘fine’—origin obscure: perhaps from Hindi ‘ṭhīk hai’ (‘all right’) or from ‘the ticket’ (‘the correct thing’); or it may simply be a purely fanciful formation

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