davy

noun2

1. •
   A Davy lamp, a type of safety lamp.

   • The miner knew the old davy was safer than any open flame, but far riskier than a modern flashlight.
2. •
   An affidavit, a legally binding statement or oath

   • Rather than testify in open court, each sailor posted a davy before sailing off.

noun1

1. •
   A Davy lamp.

   • […] the experience of more than one of the best-regulated collieries of the north of England, where a vast number of Davies are in daily use. — 1845