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English definition of “side”

side

noun [C] (SURFACE)   /sɑɪd/
a surface of something that is not the top or the bottom , or a surface of a flat object : Label all four sides of the box . I painted one side of the boat green to see if we like the color . The trail leads up the side of the mountain . Please write on only one side of the paper . A side is also a surface that is not the front or the back: There’s a scratch on the side of my new bookcase .
(Definition of side noun (SURFACE) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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