BATTEN

batten. Batten, v. to flatten, indulge, form with battens

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Bat″ten (băt″t'n), v. t. [imp. & p. p. Battened (–t'nd); p. pr. & vb. n. Battening.] [[See Batful.]] 1. 1. To make fat by plenteous feeding; to fatten. “Battening our flocks.” Milton.
2. 2. To fertilize or enrich, as land.