"flop up" is not a grammatically correct or commonly used phrase in written English.
It is possible that it may be used in colloquial or informal speech, but it would not be considered standard English. A more appropriate phrase would be "flop over" or "flop down." Example: The toddler flopped over onto the couch in exhaustion after a long day of playing.
"You have to... you have to...," I said, scrambling all over them, my hands flopping up and down, as if I were swimming toward a distant lighthouse.
Ali gets two more when he mistimes a pull across the line and the ball flops up in front of deep midwicket.
As the defibrillators that Mrs. Gallo was wired to kicked in, her body flopped up and down on the operating table in the electrophysiology laboratory at St. Francis Hospital, The Heart Center, in Roslyn.
One for Samuels, one for Gayle with another mistimed pull that just flops up towards the vacant mid-on area, one for Samuels again, and one for Gayle, before two dot balls.
When I run (which I only do if I am being chased or need to get to Everything's $1 Day at the Salvation Army), my vague approximation of a bosom flops up dangerously, like oranges in tube socks, wielding themselves menacingly up near my head with every step.
Curtis covers the making of every film, big or small, hit or flop, right up to the arduous days of shooting "Guess Who's Coming to Dinner," which Tracy — by that time in extremely poor health — completed just before his death, in 1967.
Get just a few of the details wrong or misjudge the tone, and Eurobeat would flop belly-up.
Soutter plans next on bringing out pricier blends, costing up to $15, even though many low-end brands have flopped going up market.
According to Audubon, the chat sometimes "performs a musical display flight, flopping awkwardly up and down with legs dangling, while singing".
