Idioms and Phrases with last-ditch effort
A desperate final attempt, as in We're making a last-ditch effort to finish on time. This expression alludes to the military sense of last ditch, “the last line of defense.” Its figurative use dates from the early 1800s.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.