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arch (oneself) over
to bend or curve over. (Oneself includes itself.) The tree arched over in the wind. Arch yourself over gracefully and then straighten up. The tree arched itself over in the windstorm.
arch over someone or something
to bend or curve over someone or something; to stand or remain bent or curved over someone or something. The trees arched gracefully over the walkway. A lovely bower of roses arched over the bride.
arch something over someone or something
to place something above someone or something to form an arch or archway. The cadets arched their swords over the bridal couple. The willow arched its long drooping branches over the tiny cabin.