v.1. To flow out through some breach or flaw in a container; seep out: Water leaked out the crack in the pipe. As the air leaked out of the balloon, it got smaller and smaller.
2. To become known to the public through a breach of secrecy: We were supposed to keep the date a secret, but it leaked out.
3. To release secret information to the public through unofficial channels: A disgruntled worker leaked the scandalous information out to the reporter. Someone leaked out news of the fraudulent business deal to the newspapers.