1. Open involuntarily
   "His mouth dropped open"
   - fall open

Derived forms: drops open, dropped open, dropping open

Type of: drop, drop down, sink

• a
• A battery
• a bit
• a bit much
• a capella
• a capella singing
• a cappella
• a cappella singing
• a couple of
• a dime a dozen
• a few
• a fortiori
• a good deal
• a great deal
• a hundred times
• a Kempis
• a la mode
• A level
• a little
• a lot
• a million times
• a month of Sundays
• a posteriori
• a priori
• A road