She made a startling confession on her deathbed. [=just before she died]临终前她做了令人吃惊的忏悔。

She's convinced that the old man is on his deathbed, but he looks healthy enough to me.她确信老头已奄奄一息，但在我看来他显得还很健康。

I was so sick with the flu—practically on my deathbed.我患了严重的流感——实际上已病入膏肓。