v. trans. To provide with a tongue or projection for fitting into a groove. Cf. FEATHER sb. 16 c.
1851. Beck’s Florist, 50. For the bottom, the boards are placed lengthways, ploughed and feather-tongued, and bolted together with 3/8 bolts and nuts.
1858. Skyring’s Builders’ Prices, 27. Three inch deal … feather-tongued.
