Definition
To have already learned or gained experience in something, which could be beneficial in the future.
掌挙在身（未來可能有助益）
He already had a few years of relevant experience under his belt before starting the new job.
他在開始這份新工作之前，已經有幾年的相關經驗了。
Once you complete this project, you'll have another accomplishment under your belt to put on your resume.
一旦你完成這個項目，你的簡歷上就會多一個成就。
She has a master's degree under her belt, which is very helpful for her career advancement.
她已經取得了碩士學位，這對她的職業發展非常有幫助。