concertina /kon-sər-tēˈnə/

1. A (usu hexagonal) musical instrument consisting of a pair of bellows, the sounds produced (when the bellows are squeezed and the buttons pressed) by free vibrating reeds of metal, as in the accordion
2. Anything of similar folded-up shape

To collapse or fold up like a concertina

• drogue
• drogue bomb
• drogue bombs
• drogue parachute
• drogue parachutes
• drogues
• droguet
• droguets
• droich
• droichier
• droichiest
• droichs
• droichy
• droil
• droiled
• stouthries
• stouths
• stoutish
• stoutly
• stoutness
• stoutnesses
• stouts
• stovaine
• stovaines
• stove