double (someone) up/over
phrasal verb with double verb [ I or T ] uk/ˈdʌb.əl/ us/ˈdʌb.əl/
（通常指由于痛苦或大笑而）弯腰，前仰后合
If you double up/over, or if something doubles you up/over, you suddenly bend forwards and down, usually because of pain or laughter.
Most of the crowd doubled up with laughter at every joke. 人群中的大多数人每听完一个笑话都会笑得前仰后合。
She was doubled up/over with the pain in her stomach. 她肚子疼得直不起腰来。