baseball cap noun
plural baseball caps
plural baseball caps
Learner's definition of BASEBALL CAP
[count]
: a rounded cap that fits close to the head and that has a long visor棒球帽 ◊ Baseball caps were originally worn only by baseball players as part of their uniform but are now worn by many people.棒球帽作为球员制服的一部分最初只为棒球队员所戴,不过现在已为许多人所戴。
— see picture at hat