To sharpen with a hone.

1. To make more subtle or refined; SYN. sublimate, subtilize.
2. To weaken the consistency of (a chemical substance); SYN. attenuate.
3. Make thin, rare or tenuous.

1. To attenuate or reduce in vigor, strength, or validity by polishing or purifying
2. To make more precise or increase the discriminatory powers of
3. To reduce to a fine, unmixed, or pure state; separate from extraneous matter or cleanse from impurities
4. To treat or prepare so as to put in a usable condition