tumble-downadj.
'tʌmbldaun
中文adj. （等于tumbledown）摇摇欲坠的，即将坍塌的
词根词源
tumble-down (adj.)1791, originally "habitually falling down" and used first of horses, from tumble (v.) + down (adv.); in reference to buildings, "in a dilapidated condition," from 1818.
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