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Onomatopoeic.
буль-бу́ль • (bulʹ-búlʹ)
- glug-glug (the sound of liquid bubbling or gurgling)
- The sound of bubbles above an object that sunk and disappeared beneath the water.
- де́лать буль-бу́ль (informal) ― délatʹ bulʹ-búlʹ ― to sink