v. (UN-2 4 b.)
1828. Spearman, Brit. Gunner (ed. 2), 178. [No.] 2 unstraps the rammer-head,… and [no.] 4 unstraps the sponge.
1836. Dickens, Sk. Boz, Gt. Winglebury Duel. Up started the ostlers,… unstrapping, and unchaining, and unbuckling.
1862. Cornhill Mag., V. 34. I had a large cape folded up with my valise; so unstrapping this [etc.].
Hence Unstrapping vbl. sb.
1851. Household Words, IV. 299/2. She … busies herself with the unstrapping of my knapsack.
