v. Obs. rare. [f. TO-1 + GROW v.] intr. To grow to or towards (something).
1422. trans. Secreta Secret., Priv. Priv., 230. Tho that haue a longe heede, and the eeris to-growynge to the forhede negh to the noose.
Hence † To-growing, a. vbl. sb., a growth, an excrescence; b. ppl. a., growing on, attached.
1562. Turner, Herbal, II. 31. The iuice healeth outwaxynges or to growinges in the fleshe. Ibid., 70 b. Ornithogalum is a tendre stalk with ij. or thre togrowyng branches in ye top.
[But in these the prefix is perh. TO-2.]