Definition of bring-in
The term is probably unfamiliar to you since it is only found in a few poker variants that don't include the most popular variants like hold’em and Omaha. bring-in is a forced bet in Seven-card stud and Razz in particular. The forced bet must be paid by the player who receives the worst preflop card. This bet is always smaller than a normal regular bet. The bring-in is almost always paid in the first round of betting.
Additional details on the bring-in
When a player pays on bring-in, he will always have the option to raise to make a normal bet (a "full bet"). The action of paying this bet is called "bringing it in in" or "bringing in the pot". In Seven-card stud, to determine who will pay the bring-in, all players will be dealt face-up cards. In case of a tie, the player with the worst card will be the bring-in. In case of a tie, the worst card will be determined by its suit according to the following chart (from the lowest to the highest suit): Clubs, Diamonds, Hearts, Spades. So, if one player has a two of spades and another has a two of clubs, the player with the two of clubs will be bring-in.