Meanings
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1
noun
a secondary staircase at the rear of a building, traditionally used by servants or tradespeople
The maid led the messenger up the backstairs to avoid the crowded hall.
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2
adj
secret, underhand, or conducted through unofficial influence
The appointment followed months of backstairs bargaining among party leaders.
Thesaurus
Etymology
A compound of back + stairs. The literal term named a rear or service staircase away from a house's formal rooms. Because servants, private visitors, and political intermediaries could use such routes unseen, backstairs developed an adjective sense for secret or underhand influence.