reservist
🇺🇸
/rɪˈzɜːrvɪst/
🇬🇧
/rɪˈzɜːvɪst/
Someone who is part of a group of extra soldiers, sailors, etc., that can be called to serve when needed.
The reservist was called up for duty when the navy needed more people.
海軍がより多くの人員を必要としたときに、予備役が任務に呼び出されました。