1916 G.R. Sims Anna of the Und. 72: In all other matters her intermediary was John Barrasford, who had been at one time the ‘brains’ of the gang, a man who obtained information of coups to be brought off and arranged the plans of the campaign, but always kept discreetly aloof from the field of operations when they were being carried out. The intimacy brought about by the constant meeting of the ‘brains’ of the International and the young and fascinating female spy gradually ripened into mutual affection.at brain, n.1
1916 G.R. Sims Anna of the Und. 219: If that ain’t a German spy, I’ll eat my head.at eat one’s head (v.) under eat, v.
1916 G.R. Sims Anna of the Und. 204: We take the swag, and you can bet on me that it will be worth having, or I shouldn’t be on the lay.at on the lay under lay, n.3