v. nonce-wd. intr. To sing or play in concert, make a concert. (colloq.)
1883. G. H. Boughton, in Harper’s Mag., April, 695/1. Loads of pigs and geese … ‘concertizing’ horribly.
1888. Pall Mall G., 21 Feb., 4/2. ‘I cannot concertize any more. I am tired.’ So says little Hofmann. Ibid. (1889), 5 Nov., 2/1. Rubinstein … after some years of concertizing.
