What does grass-grown mean?
Grass-grown means Covered with or overgrown with grass..
Pronunciation varies by accent · adjective
Covered with or overgrown with grass..
Then came the Great War, the Irish troubles, and the diversion of most of the American traffic to Southampton; the new construction was promptly dropped, and only grass-grown earthworks and cuttings now remain.
There are numerous sheds in the now grass-grown yard, most of which now house threshing machines and farm carts instead of locomotives and rolling stock, although [in] the roofs of some are gaping holes.
[...] Camerton Colliery has closed down and the railway sidings here are empty and grass-grown; [...].
Choose a synonym only when it preserves the intended meaning, tone, and grammar of the full sentence.
Grass-grown means Covered with or overgrown with grass..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Then came the Great War, the Irish troubles, and the diversion of most of the American traffic to Southampton; the new construction was promptly dropped, and only grass-grown earthworks and cuttings now remain.
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