a person living in a cave, especially in prehistoric times （尤指史前时期的）穴居人 - (also trog)(British English, informal)
a person with bad social skills and low intelligence （尤指史前时期的）穴居人
Word Originlate 15th cent.: via Latin from Greek trōglodutēs, alteration of the name of an Ethiopian people, influenced by trōglē ‘hole’.