a : a device for hurling clay pigeons to the air b : sand trap c : a piece of leather-based or portion of interwoven leather straps concerning the thumb and index finger of the baseball glove that forms an extension with the pocket （尤指为利用而）收集，存住，保存（热量、水等） A greenhouse stays warm https://claytonznxju.shotblogs.com/trap-for-dummies-44372605