I’m late to the fray but I was at the Blue Ridge Music Center a few weeks back. The seasoned fiddle players signaled the end of every tune with the “kick” or while seated, they raised their foot. Everyone knew the tune was ending.
To start a song, I have heard “Kick it Off” many times. Maybe when it’s time to end, “Take it Out” or “Take it Home”. I can almost her @BanjoBen calling out, “Take it Home Katy”.