Cover
. To break cover. To start from the covert or temporary lair. The usual earth-holes of a fox being covered up the night before a hunt, the creature makes some gorse-bush or other cover its temporary resting-place, and as soon as it quits it the hunt begins.
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Entry taken from
Dictionary of Phrase and Fable,
edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.