“下弯的”常见英文表达是 downward-curving 或 down-curving，也可根据具体语境使用 bent downward（向下弯曲的） 、sagging（下垂的、下弯的，常形容因重力而下垂） 等表述。例如：
The bridge has a downward-curving arch.（这座桥有下弯的拱形结构 。）
The leaves showed a slight down-curving at the edges.（叶子边缘有轻微的下弯。）
His shoulders had a bent downward appearance from years of hard work.（由于多年的辛勤劳作，他的肩膀呈现出下弯的样子。 ）
The sagging roofline gave the old house a forlorn look.（下弯的屋檐线让这座老房子显得很凄凉。）