leakleak1 /lik/ ●●● verb 1 [intransitive, transitive] to let a liquid or gas in or out of a hole or crack: Somebody’s car must be leaking oil. The roof’s leaking!2[intransitive] to pass through a hole or crack: Gas was leaking out of the pipes.THESAURUSpour, flow, drip, ooze, gush, spurt, come out► see thesaurus at pour3[transitive] to deliberately give secret information to a newspaper, television company, etc.: Details of the president’s speech were leaked to reporters.—leakage noun [countable, uncountable]leak out phrasal verb if secret information leaks out, a lot of people find out about it