Student or Learner
Does the phrase "to spare money" exist?
Thank you for your help
Where did you see that?
Context helps when asking a question like yours.
There is such a thing as "spare change" and an expression, "to spare no expense."
Also, I see no problem with this sort of utterance (which you might hear from someone down on his luck and asking for a small amount of money): 'Spare a <nature-of-request> for a poor <self-description>' - the general case of which bhai's Buddy can you spare a dime? is an instance.
Google any sequence of three words, and you'll get hits---mostly porn, but often contexts you would never have thought of in a thousand years. Come to think of it, I usually wouldn't have thought of the porn, either. What we native speakers are saying is that there is no fixed expression that includes "to spare money", the way there is with "to spare a [monetary unit]" or "spare change". Here's one sentence, as unlikely as it may be, off the top of my head: The Chancellor wants to spare money the embarrassment of devaluation.
COCA gives no examples of spare (verb) money, three of spare the money, eighteen of spare a dime (17 of them referring directly to the song bhai mentioned, ''Buddy/brother can you spare a dime?'), two of spare a dollar, one of spare a nickel and none of spare a cent.
bhai's answer in post #2 is looking good to me.