Read the dictionary definition of cab. All definitions for this word.
1. a car driven by a person whose job is to take passengers where they want to go in exchange for money
2. small two-wheeled horse-drawn carriage; with two seats and a folding hood
3. a compartment at the front of a motor vehicle or locomotive where driver sits
4. ride in a taxicab
See also: Merriam-Webster definition of cab