cave man
成語所屬單字cave
cave man — 慣用語
1. an ancient human who lived in caves; also used informally to describe a man with
1.慣用語
釋義
穴居人（食古不化的人）
an ancient human who lived in caves; also used informally to describe a man with very old-fashioned or rough manners
例句
The museum exhibition shows how cave men made tools from stone.
My uncle is a bit of a cave man when it comes to using a smartphone.