Moverse sin carro

Question

As I have been learning spanish, castellano, why is carro used?  Carro does not mean car here.  Therefore I thought the phrase was 'sin caro:,  ie without costing a lot.

Silvia Píriz · Accepted Answer

Hola Sarah E.
In this sentence, carro does indeed mean "car".
The word carro is commonly used in many Latin American countries to mean car, while in Spain the more usual word is coche. Both words are correct; the choice depends on the regional variety of Spanish.
So:
Es difícil moverse sin carro. (Latin American Spanish)
Es difícil moverse sin coche. (Spain)
Both mean "It's difficult to get around without a car."
The expression sin caro would not work here. Caro is an adjective meaning "expensive", so it would need a noun to modify (e.g. un coche caro = "an expensive car"). It cannot be used on its own after sin to mean "without costing a lot".
I hope that helps!
Silvia