Sub ( noun , verb )

(As a noun)

Sub ( noun )

1. A submarine.
2. A sandwich made on a long, narrow roll.
3. A subordinate or assistant.

Origin:

Shortened form of submarine, subway, or substitute.

Examples:

1. The sub was diving to great depths in search of undersea treasure.
2. I ordered a meatball sub for lunch.
3. She's a sub for the math department.

(As a verb)

Sub ( verb )

1. A submarine.
2. A sandwich made on a long, narrow roll.
3. A subordinate or assistant.

Origin:

Shortened form of submarine, subway, or substitute.

Examples:

1. The sub was diving to great depths in search of undersea treasure.
2. I ordered a meatball sub for lunch.
3. She's a sub for the math department.