1. the sound made by a duck

1. making the harsh sound that a duck makes
Usage: present participle of ‘quack’

1. making duck-like sounds

Examples

• The ducks were quacking loudly in the pond.
• We could hear quacking from the marsh nearby.
• The mother duck kept quacking to call her ducklings.
• The constant quacking woke us up early.
• A quacking sound echoed across the lake.
• The children imitated the quacking ducks at the park.