“He drew deeply on his hookah, wheezing and coughing, making it burble and bubble in the still air.”

“During the lecture, the professor would burble on about the history of art, leaving the students utterly confused and struggling to understand her unintelligible explanations.”

“A Soviet sub carrying rotten caviar and toxic waste cabbage broth is scuttled and the oozing brew burbles into the depths of the ocean.”

“We sit down to talk in an upstairs boardroom and are joined by Sylla's young nephew, who burbles quietly to himself then falls asleep.”

“A steel drum or Hawaiian guitar burbles in the background, strangely haunting.”

“He could have burbled on, said things he didn't mean to say, kept it going just for appearances.”

“Some were caked with layer upon layer of old food, others burbled ominously with fresh unsavory indelicacies.”

“Some of these engines pumped water, while even more burbled away on kero and did... something.”