Posted on 4th September 2012 by melyn Tavoseth is the Cornish word for idiom Yes, idiom in Cornish is tavoseth Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Post navigationPrevious post: Unyethek is the Cornish word for monoglotNext post: Aswonvos is the Cornish word for knowledge