予よ備び委い員いん

noun

reserve member; alternate member

Refers to a person appointed as a backup or alternate member of a committee, board, or similar body, ready to serve when a regular member is unavailable.

• 彼かれは委い員いん会かいの予よ備び委い員いんに選えらばれた。

  He was selected as a reserve member of the committee.