1. a portable musical instrument with a keyboard and bellows that produces sound when air is forced through reeds

1. having folds that can expand and contract like the bellows of an accordion

Examples

• She played a lively polka on her accordion.
• The street musician’s accordion filled the air with folk melodies.
• He learned to play the accordion from his grandfather.
• The accordion doors folded neatly against the wall.
• Her accordion-style wallet expanded to hold many cards.
• The accordion file kept all her documents organized.
• The accordion pleats in her skirt created an elegant silhouette.