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ground floor (n.)

also ground-floor, c. 1600, from ground (n.) + floor (n.); figurative use is from 1864.

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Definitions of ground floor from WordNet

ground floor (n.)
the floor of a building that is at or nearest to the level of the ground around the building;
Synonyms: first floor / ground level
ground floor (n.)
becoming part of a venture at the beginning (regarded as position of advantage);
he got in on the ground floor
From wordnet.princeton.edu