[UNDER-1 5 c.] A lining placed under something; the inner lining of a garment. Also fig.

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1520.  Hollyband, Vn haulse, the vnderlining of a shoe.

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1631.  Brathwait, Eng. Gentlew., 176. When the Moath shall be your vnderlining, and the Worme your couering.

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1897.  Daily News, 16 Jan., 6/5. An underlining of fine soft flannel makes them suitable for even the coldest weather.

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