1. the amount of air or other substance that fills the lungs when breathing in deeply

Examples

• She took a deep lungful of fresh mountain air.
• The swimmer surfaced and gasped for a lungful of oxygen.
• He inhaled a lungful of smoke from the campfire.
• After running up the stairs, she needed a good lungful of air.
• The diver held his breath after taking one last lungful at the surface.
• A lungful of cold winter air made her cough.