noun
side door - a door located on the side of a building or structure, typically used as an entrance or exit
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Please use the side door to enter the building as the front entrance is temporarily closed for maintenance.
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Hey, just come in through the side door, it's quicker that way.
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Let's sneak in through the side door so we don't have to pay for tickets.
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He always takes the side door in arguments, avoiding confrontation.