Entry 2 senses · 2 variants Webster, 1913 Roughen · Rough·en · IPA /ˈɹʌfən/ v. t. v. i. 01 v. t. To make rough. imp. & p. p. Roughened; p. pr. & vb. n. Roughening 1. To make rough. 02 v. i. To grow or become rough. 1. To grow or become rough.