Farewell message - 悔しさをバネに


On my last day my co-worker told me this. I'm not sure what バネに means. I tried
looking it up but didn't get anywhere.

> ここでの悔しさをバネに、次のとこでもがんばってくださいね




It's an omission from バネにして, and the sentence means "Make your regret you felt
here into a spring and do your best in the next place as well".

