sonobuoy

"Give the motor a listen and tell me if it sounds off."

"I am still hoping that all will turn out well."

"During World War II, submarines played a crucial role in naval battles. "

"He turned when he heard the sound of footsteps behind him.  Nobody made a sound."

"The aquifer's underwater supply of fresh water is crucial for the town's water system. "

"The smoke detector detects smoke and sounds an alarm. "

"The company deployed extra staff to the customer service department to handle the holiday rush. "

"The submarine traveled deep beneath the waves. "

"The student's sudden absence was an unusual for her. "

"The children collected colorful objects from the beach, like seashells and smooth stones. "

"The flashing red light was a signal that the school cafeteria was out of pizza. "

"We flew over the city in a helicopter."