leap-frog

n [U] game in which each player in turn leaps with parted legs over another who is bending down 跳背游戏. v (-gg-) [Tn] leap over (sb) in this way 跳过（某人）（作跳背游戏）.

leading-rein, leaf, leaf-mould, leafage, leafless, leaflet, leafstalk, leafy, league, leak, leakage, leaky, lean, lean out of, lean-to, leaning, Leaning Tower Pisa, leanness, leap, leap year, learn, learn by heart, learn by rote, learn from, learn of, learn off, learned, learnedly, learner, learner driver, learning, lease, leasehold, leaseholder, leash, least, leastways, leastwise, leather, leather-jacket, leatherette,