adv. [ Flat, a. + adverbial suff. -ling. ] With the flat side, as of a sword; flatlong; in a prostrate position. [ Obs. ] Spenser. [ 1913 Webster ]
adv. With the flat side downward; not edgewise. Shak. [ 1913 Webster ]
adv.
He that does the works of religion slowly, flatly, and without appetite. Jer. Taylor. [ 1913 Webster ]