Crack, to walk a

(A crack or line in the floor?)

1825.  Agreeably to the good old maxims of English prudence, I determined in my own mind, only to drink up three-fourths of my wages, and to save the rest, to buy a farm in the western country, where I intended to go and set up for a member of congress, when I had qualified myself by being able to walk a crack after swallowing half a gallon of whiskey.—J. K. Paulding, ‘John Bull in America,’ p. 81 (N.Y.).

1902.  He could walk a crack with a gallon sloshin’ about in ’im.—W. N. Harben, ‘Abner Daniel,’ p. 73.