An "unfinished object" in knitting or other kinds of craft.
A powered troweling machine with spinning blades used to spread concrete.
A whirling trick performed with devil sticks.
A dragonfly.
The winged fruit of certain trees, such as ash, elm, and maple.
An aircraft that is borne along by one or more sets of long rotating blades which allow it to hover, move in any direction including reverse, or land; and typically having a smaller set of blades on its tail that stabilize the aircraft.
To rotate like a helicopter blade.
To overprotect one's children, as a helicopter parent does.
To travel by helicopter.
To transport by helicopter.