What is another word for bob under?
Pronunciation: [bˈɒb ˈʌndə] (IPA) 
The phrase "bob under" can mean to dive or submerge quickly beneath the surface of water. Synonyms for this phrase include duck, plunge, sink, submerge, and dip. These words all convey a sense of sudden and swift movement downward. "Duck" implies a quick and sudden movement downward, like a duck diving for food. "Plunge" and "sink" suggest a forceful and sudden descent, as if jumping into water. "Submerge" and "dip" are more general and can refer to any type of quick underwater movement. Overall, these synonyms allow for a variety of ways to express the idea of diving or submerging quickly underwater.
