Real Dictionary

catch
verb: If one thing catches another, it hits it accidentally or manages to hit it.
verb: If something catches on or in an object or if an object catches something, it accidentally becomes attached to the object or stuck in it.
verb: If you catch a part of someone's body, you take or seize it with your hand, often in order to stop them going somewhere.
verb: If you catch a person or animal, you capture them after chasing them, or by using a trap, net, or other device.
verb: If you catch an object that is moving through the air, you seize it with your hands.
verb: If you catch someone doing something wrong, you see or find them doing it.
verb: If you catch yourself doing something, especially something surprising, you suddenly become aware that you are doing it.
verb: When you catch a bus, train, or plane, you get on it in order to travel somewhere.

catch in American English
to seize and hold, as after a chase; capture
intransitive verb: to become gripped, hooked, or entangled
transitive verb: to seize or capture, esp. after pursuit