The phrase "do a runner," often used to describe someone who flees a situation or skips out on a bill, has several antonyms. One could say that someone "stuck around," "remained present," "finished what they started," "paid their bill," or "fulfilled their commitment." Other antonyms for "do a runner" might include "showed up," "kept their word," "stood their ground," or "followed through." Essentially, any phrase that implies remaining in place or completing an obligation could be considered an antonym for "do a runner." These antonyms suggest reliability, accountability, and honesty, traits that are often lacking in those who "do a runner.