As a noun:
* The chum attracted a school of hungry fish. (Referring to bait used in fishing)
* The old sailor was a real chum, always ready with a joke. (Meaning a close friend)
* We used chum to lure the sharks closer to the boat. (Referring to bait used to attract sharks)
As a verb:
* We chummed the water with some sardines to attract the tuna. (Meaning to throw bait into the water)
* The kids chummed around together, laughing and playing. (Meaning to hang out with friends)
As an adjective:
* He had a chum face, always smiling and friendly. (Meaning a friendly, good-natured face)
The meaning of "chum" can vary depending on the context. It's important to understand the different meanings to use the word correctly.