He who carries three baskets must put one on his head , which is apt to thumble and trip him up.
提三个篮子的人,必须把一个顶在头上,而这个篮子很可能倒下来,把他自己绊倒。
guy thumble:拉线衬环
牵绳 guy rope | 拉线衬环 guy thumble | 牵线,拔线 guy wire