pickon one's last legs . on one's last legs {adj. phr.} Failing; near the end. The blacksmith's business is on its last legs. The dog is old and sick. He is on his last legs. Compare: ONE FOOT IN THE GRAVE, ON ONE'S KNEES (2). Categories: add yours adjective death Source: A Dictionary of American Idioms Subscribe to: American IdiomsEnglish Slang Discuss