back·spin

[bak-spin]
noun
reverse rotation of a ball causing it to bounce or roll backward or stop short.
Also called underspin.


Origin:
1905–10; back2 + spin

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World English Dictionary
backspin (ˈbækˌspɪn) [Click for IPA pronunciation guide]
 
n
sport Compare topspin a backward spinning motion imparted to a ball to reduce its speed at impact, as by hitting it with a downward or undercutting motion

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Backspin is always a great word to know.
So is ninnyhammer. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a fool or simpleton; ninny.
Example sentences
To prevent backspin of the pump or running engines in reverse direction, a non-slam check valve should be used.
Provisions shall be made to prevent energizing the motor in the event of a backspin cycle.
Provision shall be made to prevent energizing the motor in the event of a backspin cycle.
He also shows how to put a gentle backspin on a ball.
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