Bajar vs. salir
While both Spanish words bajar and salir can sometimes involve exiting something, they are not interchangeable. The fundamental difference lies in the direction and context of the movement. Bajar implies a downward motion, while salir refers to moving from an enclosed space to an open one.
Bajar
A1The primary meaning of bajar is to go down, to get off, or to lower. It always involves a movement from a higher position to a lower one, whether it's physical, like walking down stairs, or figurative, like lowering the volume.
Voy a bajar al primer piso.
(I am going to go down to the first floor.)
Tienes que bajar del tren en la siguiente estación.
(You have to get off the train at the next station.)
Por favor, ¿puedes bajar las cajas del estante?
(Please, can you get the boxes down from the shelf?)
El niño se bajó del árbol con cuidado.
(The child got down from the tree carefully.)
El precio de los aguacates va a bajar la próxima semana.
(The price of avocados is going to go down next week.)
Necesito bajar el archivo que me enviaste.
(I need to download the file you sent me.)
Salir
A1The primary meaning of salir is to go out, to leave, or to exit. It describes the action of moving from an interior space to an exterior one, or leaving a specific place. It doesn't necessarily imply a downward motion.
Vamos a salir de la oficina para almorzar.
(We are going to leave the office to have lunch.)
¿A qué hora sales del trabajo hoy?
(What time do you get out of work today?)
El gato siempre quiere salir al jardín.
(The cat always wants to go out into the garden.)
Mis amigos y yo vamos a salir de fiesta el sábado.
(My friends and I are going to go out partying on Saturday.)
El sol va a salir en pocos minutos.
(The sun is going to come out in a few minutes.)
Si mezclas azul y amarillo, te sale el color verde.
(If you mix blue and yellow, you get the color green.)
Summary
In essence, the choice between bajar and salir depends on the nature of the movement. Use bajar for any downward motion, such as going down stairs, getting off a bus (which involves a downward step), or lowering an object. Use salir for exiting or leaving an enclosed space, like a room, a building, or a city, where the focus is on moving from inside to outside.