Related Clues:

• Tugboat blast
• Sound of impatience
• Train sound syllable
• Palindromic sound effect
• Noisemaker noise
• When doubled, tot's train
• Horn output
• End of a sneeze?
• Horn note
• Sound from a jam
• Play on pipes, palindromically
• Half a whistle?
• Car-horn sound
• Sound the horn
• Honk the horn