colloq. and slang. To be off.
1877. E. Peacock, N. W. Lincoln. Gloss. (E. D. S.), Bunk, to run away, to make off.
1880. Besant & Rice, Seamy Side, ix. 67. Mark my words, Bunk it is.
1881. Leicestersh. Gloss. (E. D. S.), Bunk … budge! be off! apage!
