Etymology
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off-line (adj.)

1926, of railroads, "not done on a railway;" 1950, in computing, "not controlled by or connected to a computer or network;" from off (prep.) + line (n.).

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Definitions of off-line

OFF-LINE (adj.)
not on a regular route of a transportation system;
an off-line ticket office
OFF-LINE (adj.)
not connected to a computer network;
off-line resources
From wordnet.princeton.edu