Last-gasp and Last-ditch

Last-ditch and last-gasp are semantically related In some cases you can use "Last-ditch" instead an adjective phrase "Last-gasp".

Last-ditch adjective - Of something done as a final recourse (especially to prevent a crisis or disaster).

Last-gasp and last-ditch are semantically related in last-minute topic. You can use "Last-gasp" instead an adjective phrase "Last-ditch". informal substitute