int. slang. Obs. Variant of CATSO; but perh. associated with COTS.
1728. Vanbr. & Cib., Prov. Husb., I. iii. Cotso! I know ’em a little.
1741. Richardson, Pamela, III. 374. Cot-so, Madam, that mayn’t be so well, neither!
