To maintain; to preserve; to prevent from deteriorating or falling.
The NRA is pumping groundwater into the River Itchen in Hampshire to keep up its flow and is trying to save three streams, the Tong, the Little Stour and the Dour from going dry this summer.
To continue with (work, etc).
Non obstante the Change of Religion, the Plough-boies, and also the Schooleboies will keep-up and retain their old Ceremonies and Customes and priviledges.
From Middle English kepen up (“to perpetuate, maintain, preserve”), equivalent to keep + up.
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