Leak (noun)

1. An unintended hole, crack, or opening that allows a fluid or gas to escape.
2. An accidental escape of confidential information to the public, especially by a government or other official organization.

Origin:

Middle english (in the sense "emission of bodily fluid"): from old norse lek, of germanic origin.

Examples:

1. The leak in the roof was causing a dripping sound in the living room.
2. The leak in the oil pipeline caused a major environmental disaster.
3. The leak of confidential documents embarrassed the company and caused major damage to its reputation.
4. The leak of exam papers caused a major scandal and an investigation was launched.
5. The leak of classified information was a serious breach of national security.