de balde

Etymology
Attested since circa 1300. Ultimately from, from

Adverb

 * 1) gratis, for free
 * 2)  uselessly, in vain
 * 1)  uselessly, in vain

Adverb

 * 1)  for free, for nothing
 * 2)  for a song
 * 3)  left over, unwanted