Toot
toot
You could 'toot' your horn...
It means "I am altering my course to starboard"
A. Three long blast of the ships whistle or general alarm at an interval of three, means a man overboard. This is dismissed by three short whistle blast. B. Three Short blast can also be Rule 34 (Inland and International) "Maneuvering and Warning Signals." Three short blast means "I am operating astern propulsion."
Two short horn blast from a vessel means that she is turning port and one short horn blast that she is turning starboard
A palindrome for the sound of a horn is "toot."
"I am about to turn to starboard".
A palindrome for blowing a horn could be: 'toot'.
On seagoing vessels in restricted visibility a prolonged blast on the ships whistle means the vessel is making way through the water.
three short blast
A whistle or horn
The palindrome word for "horn sound" is "honk."