He overbalanced and fell into the water.他失去了平衡，落入水中。For one agonizing moment, the dish was perched precariously on the bank of the canal, but It'suddenly overbalanced and slid back into the water.在令人坐卧不安的一瞬间, 馅饼盘悬悬乎...

overbalanced的音标：...

v.（使）失去平衡而歪倒( overbalance的过去式和过去分词 )...