free ride

Short definition from Wiktionary

Noun

1. 1
   An opportunity or benefit which has no cost, especially one enjoyed or undertaken at the expense of others.
2. 2
   The practice of buying and selling shares or other securities without actually having the capital to cover the trade.
3. 3
   A hand in which a player can remain without betting further money.

Verb

1. 1
   To take a free ride; to take advantage of a benefit without contributing.
2. 2
   To buy and sell shares or other securities without actually having the capital to cover the trade.
3. 3
   Alternative form of free ride.