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Meaning of “back” - Learner’s Dictionary

back

noun [C]     /bæk/
NOT FRONT
A2 the part of something that is furthest from the front or in the opposite direction to the front: He wrote his number down on the back of an envelope. We were sitting near the back and couldn't see much. I always keep a blanket in the back of the car.Surfaces of objectsEdges and extremities of objects
BODY
A2 the part of your body from your shoulders to your bottom: back injuries/pain He was lying on his back. The human torso
SEAT
the part of a seat that you lean against when you are sitting: the back of a chairChairs and seats
back to front ( also US front to back)
with the back part of something where the front should be: You've got your trousers on back to front.Backwards, sideways and back and forth
in back of US
behind: They sat in back of us on the plane.After and behindBefore, after and already
→  See also a pat on the back , be (like) water off a duck's back , at/in the back of your mind , behind sb's back , be glad/happy, etc to see the back of sb/sth , be on sb's back , turn your back on sb/sth
(Definition of back noun from the Cambridge Learner’s Dictionary © Cambridge University Press)
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