Definition
The item or person immediately preceding the last one in a sequence.
倒數第二個
Among the contestants, he was the last but one to be chosen.
在參賽者中，他是倒數第二個被選中的。
This book is the last but one on the shelf.
這本書是書架上的倒數第二本。
The last but one item on the meeting agenda is the financial report.
會議議程上的倒數第二項是財務報告。