Added 9 October 2026 tumbling noun Categories: ActionsRare Words noun ! Definition from WordNet 3.1, Princeton University. More about tumbling at Wordnik → Where our words come from → The gymnastic moves of an acrobat. Related Words: fallingbillowingmovingacrobaticsrollingdeterioratingplansomersaultingflippingstumblingtopplingcollapsing Back to today's word