whetstone

(礪)
grind
to grind, sharpen, or polish, often used figuratively for self-improvement
sandstone
a type of coarse stone used for grinding or as a whetstone

Frequency

Character
Written text
4,760th most common 1.21 per million
Movie subtitles
4,508th most common 0.210 per million appears in 0% of films
Word
Written text
1.94 per million

Details

Simplified
Strokes
19
Unicode
U+792A

Sources