Definition of "slow up" []

• To slow, slow down, decelerate. (verb)

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• "Late yesterday morning, when the twelve-three from Birley had just pulled out and the slow up train from Yarmouth, laden with summer travellers, was in the station, the quiet little country junction of Boarbridge was visited by an explosion so sudden and terrible that Mr. Harold Phipps, the stationmaster, tells me that he has seen nothing like it since the War."