tranquilizer
🇺🇸
/ˈtræŋkwəlaɪzər/
🇬🇧
/ˈtræŋkwəlaɪzə(r)/
A medication that helps to calm a person or animal.
The doctor prescribed a tranquilizer to help her sleep at night.
医生开了一种镇静剂帮助她在夜间睡眠。