[-ING1.] The action of the verb CRUMPLE; a crumpled condition. Also attrib., as crumpling-irons.
1855. Thackeray, Newcomes, I. 233. In Miss Ethel’s black hair there was a slight natural nipple … [which others] endeavoured to imitate by art, paper, and I believe crumpling irons.
1862. Dana, Man. Geol., 650. The folding or crumpling of the clayey layer subjected to the pressure.
1866. A. Flint, Princ. Med. (1880), 209. Crumpling and crackling sounds.
