From Longman Dictionary of Contemporary Englishbeach ballˈbeach ball noun [countable] DLOa large coloured plastic ball that you blow air into and use for playing games on the beach
Examples from the Corpus
beach ball• Well, the example reminds me distinctly of a beach ball seen end-on.• Prop yourself up on your elbows and place a beach ball between your knees.• Eventually that contest was supplanted by a wonderfully violent game played in the same small space, but with a beach ball.• A beach ball fell from the overhead luggage-tray.• Arthur Smith, once a slender man, now was slender still except for the beach ball he sported under his shirt.• Sitting crossed legged place the beach ball between your elbows at shoulder level and squeeze 20 times. 9.• Place the beach ball on to your left leg inner thigh and raise you leg. 