Terminology

What is meant by “play the comb”.?

Do you mean chord? That is holes 1,2, and 3. Inhaling on a C harp gives you the G chord. exhaling on a C harmonica
Gives you a C chord, hope this helps.

I’ve been intrigued by your post so much I even asked X’s Grok. Far as I can tell, there is no particular meaning beyond “jam it out”, or just a slangy way of saying 'to play the harmonica."

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@richardhargreaves488 Welcome to the forum! Looking forward to hearing your clarification here.

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Where did you hear this term? Some context will help. Terminology can vary by region so it’d help to know where you are.