To move up and down in a lively manner.

To float lightly and move in a gentle way.

हल्के से तैरना

English Usage: The child was bobbing in the water with a life jacket.

Hindi Usage: बच्चा जीवन जैकेट के साथ पानी में हल्के से तैर रहा था.

A quick, short movement up and down.

उपर-नीचे का झटका

English Usage: The bobbing of the boat made everyone uneasy.

Hindi Usage: नाव का उपर-नीचे होना सभी को बेचैन कर रहा था.