whetten

From whet (past participle) + -en.

1. 01
   derived from *kʷeh₁d-✻ — “sharp”
2. 02
   inherited from *hwatjaną✻ — “to sharpen, whet; (figurative) to incite, instigate”
3. 03
   inherited from *hwattjan✻ — “to sharpen, whet”
4. 04
   inherited from hwettan — “to sharpen, whet; (figurative) to encourage, incite”
5. 05
   inherited from whetten — “to make the edge of (a sword, tool, etc.) sharp; to grunt, snort; to scrape the ground with (one’s feet); to make a chattering or grinding sound; (figurative) of a person: to prepare for battle; to make (one’s wit) alert or keen; to strengthen (one’s heart or will); to incite, provoke”
6. 06
   suffixed as whetten — “whet + en”