overbalance /ˈəʊvəˌbæləns/ ( overbalancing, overbalanced, overbalances )

• 1. 

  V-I If you overbalance, you fall over or nearly fall over, because you are not standing properly. 失去平衡

  例：

  He overbalanced and fell head first.

  他失去了平衡而且头部先着了地。