at grass en · ADJ
Meanings
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(not-comparable) That has been put out to graze (of an animal); on grassland; grazing.
Aubrey and Stephen had a common milkman and often they drove out in the milkcar to Carrickmines where the cows were at grass.
1916, James Joyce, chapter II, in A Portrait of the Artist as a Young Man, New York, N.Y.: B[enjamin] W. Huebsch, →OCLC: