We found 2 dictionaries that define the word the rough side of one's tongue:

General (2 matching dictionaries)

1. the rough side of one's tongue, the rough side of one's tongue: Collins English Dictionary
2. the rough side of one's tongue: Wiktionary

Definitions from Wiktionary (the rough side of one's tongue) ▸ noun:  Angry words, harsh criticism. ▸ Words similar to the rough side of one's tongue ▸ Usage examples for the rough side of one's tongue ▸ Idioms related to the rough side of one's tongue ▸ Wikipedia articles (New!) ▸ Words that often appear near the rough side of one's tongue ▸ Rhymes of the rough side of one's tongue ▸ Invented words related to the rough side of one's tongue