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The Collaborative International Dictionary
foggage

Fog \Fog\ (f[o^]g), n. [Cf. Scot. fog, fouge, moss, foggage rank grass, LL. fogagium, W. ffwg dry grass.] (Agric.)

  1. A second growth of grass; aftergrass.

  2. Dead or decaying grass remaining on land through the winter; -- called also foggage. [Prov.Eng.]
    --Halliwell.

    Note: Sometimes called, in New England, old tore. In Scotland, fog is a general name for moss.

Wiktionary
foggage

n. (context UK dialect English) Dead or decaying grass remaining on land through the winter.