concertina /ˌkɒn.səˈtiː.nə/ aep /ˌkɑːn.sɚ-/ verb [I or T] UK ↑Verb Endings for concertina
► F0 to fold, crush, or push together: » In the accident, several cars concertinaed into each other.» FIGURATIVE Could we concertina the three meetings into one morning?Thesaurus+: ↑Squeezing and grinding concertina /ˌkɒn.səˈtiː.nə/ aep /ˌkɑːn.sɚ-/ noun [C]
► F0 a musical instrument with a folding middle part, which you play by pushing both ends together with the hands and pressing buttonsThesaurus+: ↑Keyboard instruments