Englishfor English speakers
recoil
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verb
(= flinch)
draw back, as with fear or pain
she flinched when they showed the slaughtering of the calf
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noun
the backward jerk of a gun when it is fired
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noun
a movement back from an impact
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verb
(= kick back, kick)
spring back, as from a forceful thrust
The gun kicked back into my shoulder
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verb
(= backfire)
come back to the originator of an action with an undesired effect
Your comments may backfire and cause you a lot of trouble
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verb
(= bounce, resile, spring)
spring back; spring away from an impact
The rubber ball bounced
These particles do not resile but they unite after they collide
operation
Noun
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An operation is a medical process, often opening the human body.
The doctors performed the operation in three hours.
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An operation is an action of a group of people working for a goal (often military).
The Army operation was a success.
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An operation is part or all of a business. small(often plural)/small
The company's East Coast operation was bigger than its West Coast operation.
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An operation is a symbol that is used to perform a specific operation (addition, subtraction, multiplication or division) in maths.
The plus symbol is used to perform a specific operation in maths which is addition.