¿Pueden ayudarme con 'andar'?
I know if you look up "andar" it means "to walk", but I see sentences like this:
Ando en un caballo negro.
La mujer anda en una bicicleta gris.
"To walk" doesn't quite fit in those examples, so can it also mean "to ride"?
Or does the "en" mean "via" and it actually means "to go via", or "to move via" in my examples?
Thanks for any help to clear this up a little. 
6 Answers
"Andar" is very versatile. It doesn't just mean "to walk". If you look in the dictionary, it has many functions.
For example:
¿Cómo andas? - How are you (doing)?
El reloj no anda. - The clock is not working.
Anda por las tiendas. - He/she is out shopping.
And in your example: "andar a caballo", "andar en bicicleta" it does have the sense of "ride", but probably is more literally translated as "go by horse/by bicycle".
PS. This reminds me of when I used to ask my grandfather "¿Cómo andas?" and he would reply "Con los pies" just to be funny. 
That is the problem with learning vocubulary from flashcards, etc. All that you learn is andar=to walk.
"andar" is commonly used for "to walk/go/be". For example:
El reloj no anda (el reloj no camina)
Mi mamá anda en la tienda (mi mamá está en la tienda)
Anda para la calle a ver si encuentras a tu padre( ve para la calle a ver si encuentras a tu padre)
A outline about "andar" from "Breaking Out of Beginners Spanish" sort of a follow up on the response from "swampy"
Andar can mean "to go around' like doing something. "Pedro anda gritando tu nombre." (Pedro is going around shouting your name.)
Slangy expressions Andar can mean: "to hang out" "Ya no ando con ellos." I don't hang out with them."
Andar for "to work/function or to run" "¿Qué tal anda tu choche?" (How's your car running?) actually/literally "How's your car walking?")
And the common expression "¡Andale!" ("Let's get a move on!)
A follow up from the response of "gintar77"
El reloj no anda. - The clock is not working.
Or (The clock is not running). Literally this is (The clock is not walking.) It is said that Spanish speaking countries have a different sense of time -- due to the fact that Spanish clocks walk rather than run. Ha ha.
From the book, 'Breaking Out of Beginners Spanish'.
Pedro anda gritando tu nombre. Pedro's going around shouting your name.
Ya no ando con ellos. I don't hang out with them anymore.
¿Por dónde andos? Whereabouts are you?
¿Qué tal anda tu coche? How's your car running?
I've noticed that some of Heiditas threads about phrases in the bar and elsewhere use forms of andar to attract attention or suggest movement. I've heard it used a lot like that down in Andalucia (no pun intended as well.
