Definitions

1. noun

a loud, sharp, or piercing sound or noise, especially one made by a device, such as an alarm or a siren.

“The klaxon sounded loudly to alert everyone of the fire drill.”

2. verb

to produce a loud, sharp, or piercing sound, especially with a device such as an alarm or a siren.

“The fire alarm will klaxon loudly to signal the fire.”