The term ALARM SOUND can be summarized by three crossword solutions: TOCSIN (6 letters), SIREN (5 letters), and EEK (3 letters). TOCSIN is a French word that refers to a loud ringing of bells, usually used to warn of danger. A SIREN is an alarm sound that is usually produced by a machine and is often used in emergency situations. Lastly, eek is an expression of surprise or fear, which is often associated with alarm sounds.