your last gasp
your (or the) last gaspthe point of death, exhaustion, or completion.
1996 Will Hutton The State We're In The failure of the 1994 rail strike was the last gasp of an old order.
your/the last ˈgaspthe point at which you/something can no longer continue living, fighting, existing, etc: People are saying that the group’s latest actions are simply the last gasp of a dying campaign.
A gasp is a quick deep breath.