leakleakleaksleakedleaking1verb (leaks, leaking, leaked)1to have a hole that liquid or gas can go through: The roof of our house leaks when it rains.The boat is leaking.2(used about liquid or gas) to go out through a hole: Water is leaking from the pipe.leakleakleaks2nouna small hole that liquid or gas can get through: There's a leak in the pipe.▶ leakyleakyleakierleakiestadjective: a leaky roof