smart money

Short definition from Wiktionary

Noun

1. 1
   Experienced, well-informed investors, gamblers, etc. considered as a group.
2. 2
   The money invested or bet by such people; by extension, the opinions of such people.
3. 3
   Money paid by a person to buy himself off from some unpleasant engagement or some painful situation.
4. 4
   Money allowed to soldiers or sailors, in the English service, for wounds and injuries received; also, a sum paid by a recruit, previous to being sworn in, to procure his release from service.
5. 5
   Vindictive or exemplary damages; damages beyond a full compensation for the actual injury done.
6. 6
   Alternative form of smart money.