gift horse

Etymology
From the economics of horse ownership, in which an aging horse of declining value continues to require feeding and stabling. Possibly influenced by the proverb.

Noun

 * 1)  An apparent gift, that has substantial associated costs or drawbacks, especially a gift that does not fit perfectly with the recipient's wants or needs.

Translations

 * Dutch: gegeven paard
 * Finnish: lahjahevonen
 * Hungarian: ajándék ló