Leak/liːk/ Definition 1 of 4Pro Tip 1/3Accidental Occurrence Emphasize the accidental nature of 'leak' — it's not deliberate. The water bottle started to leak during the hike. Pro Tip 2/3Negative Connotation 'Leak' usually implies a problem or malfunction. We have to fix the sink; it's starting to leak again. Pro Tip 3/3Physical Context Use 'leak' when referring to physical objects like containers, pipes, or tanks. The old radiator in the basement leaks when it gets too hot.