back·stroke 
(băkstrōk′)
(băkstrōk′)n.
1. Sports
a. A swimming stroke performed on one's back, especially one using alternating overarm strokes and a flutter kick.
b. A race or a leg of a race in which this stroke is swum.
2. A backhanded stroke or motion.
3. A stroke or motion in the direction of an original starting point: a saw that cuts on the backstroke.
backstroke′ v.
backstrok′er n.
- out of bounds
- out-of-bounds
- out of breath
- out of character
- out of commission
- out-of-court
- out of court
- out of date
- out-of-date
- out-of-door
- out-of-door
- out-of-doors
- out-of-doors
- out of gourd
- out of hand
- out of head
- out of humor
- out of it
- out of it
- out of joint
- out of key
- out of line
- out of luck
- out of one's gourd
- out of one's head