A baseball term that describes the state of a fly ball or line drive that touches the ground just prior to being concealed and secured by a player's glove.
The majority of trapped balls occur when an outfielder is charging a fly ball or line drive and slides forward to catch the ball with the palm side of the glove facing the ground. Although trapped balls are occasionally mistakenly called outs, if no umpire has indicated that an out has been recorded, the ball is still considered live and the current play continues. Players will often do their best to make a ball appear caught, even if it was trapped instead, in order to record an out. Traps can sometimes fool runners into holding up or returning to their time-of-pitch base, even if the batter is not called out.