boulder
🇺🇸
/ˈbəʊldər/
🇬🇧
/ˈbəʊldə(r)/
a very big rock, often found outdoors, that has been shaped by natural forces like water or weather
The children climbed on a large boulder at the park.
아이들이 공원에서 큰 바위에 올랐다.