literally: constant variety or interest (originally with reference to theatrical performances; USA, 1879)—ironically: constant variety of troubles, difficulties, etc. (in Three Men in a Boat (1889), by British author Jerome K. Jerome)
a moment of sudden discovery, inspiration or insight—1918—from the reputed exclamation of Archimedes when he realised that the volume of a solid could be calculated by measuring the water displaced when it was immersed
‘to have a fancy for’—UK, 1900—loan translation from French ‘avoir un béguin pour’—French ‘béguin’ is from ‘s’embéguiner de’, meaning ‘to put on a bonnet’, hence ‘to put a sudden capricious idea into one’s head’
USA, 1900: to get a stage act ready—Canada, 1961: to organise oneself to undertake or achieve something—from ‘to get together’ (i.e., to organise, put in order, harmonise)
Canada, 1928—resembling Jeeves, the perfect valet in stories by the English author Pelham Grenville Wodehouse (1881-1975); this fictional character first appeared in 1915
an impressive person or thing, viewed as being difficult to rival or surpass—USA, 1912, in reference to the difficulty faced by an entertainer coming on stage immediately after a popular or successful act
late 19th century—to disappear suddenly without leaving information about one’s whereabouts—from conjuring, in which ‘vanishing act’ designates an act of making a person or thing disappear as if by magic, and an act of disappearing in this manner