Definition from Wiktionary, the free dictionary
butterfly stroke (plural butterfly strokes)
- A swimming stroke in which the body is prone, the arms are moved in simultaneous circles, and the feet are kicked up and down.
2009, Jim Montgomery, Mo Chambers, “Butterfly”, in Mastering Swimming, ISBN 9780736074537, page 56:
- As you begin to integrate butterfly into your workouts, begin with two to four full butterfly strokes from the wall, then swim easy freestyle for the remainder of the length.