keep one's nose to the grindstone

VERB
33 LETTERS · STARTS WITH K

keep one's nose to the grindstone is a valid 33-letter word worth 38 points in Scrabble and 43 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
K5E1E1P3O1N1E1'0S1N1O1S1E1T1O1T1H4E1G2R1I1N1D2S1T1O1N1E1
5 + 1 + 1 + 3 + 0 + 1 + 1 + 1 + 0 + 1 + 0 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 0 + 1 + 4 + 1 + 0 + 2 + 1 + 1 + 1 + 2 + 1 + 1 + 1 + 1 + 1 =38 PTS
DOUBLE WORD → 76TRIPLE WORD → 114
MEANING

What does keep one's nose to the grindstone mean?

VERB · 1 SENSE
1

Work doggedly or persistently.

BROADER