The antonyms for the phrase "belly flopped" are "elegantly dived," "gracefully plunged," and "smoothly descended." These phrases describe a dive or jump that is performed with finesse, control, and precision. Instead of awkwardly smacking into the water or ground, an elegant dive or graceful plunge involves a smooth, controlled entry that minimizes splash or impact. A smooth descent implies poise and balance, and the ability to execute a difficult maneuver with ease. These antonyms suggest a level of skill, athleticism, and grace that is absent from the noisy, uncontrolled flop of a belly flop.