It means that the station currently transmitting on 25 will go off the air and they will become a "guest" on the "host's" post-repack channel and will be treated like a sub-channel as far as your tuner is concerned.
"Channel sharing" is exactly what it says. There will be two stations on one signal, sharing the bandwidth under the terms of their contractual agreement. The guest will pay the host for the right to use an allocated portion of the channel's bandwidth.
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