■ noun
1》 a thick revolving disc of abrasive material used for sharpening or polishing metal objects.
2》 a millstone.
Phrases
keep one's nose to the ~ work hard and continuously.
■ noun
1》 a thick revolving disc of abrasive material used for sharpening or polishing metal objects.
2》 a millstone.
Phrases
keep one's nose to the ~ work hard and continuously.
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004