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The Collaborative International Dictionary
Suppling

Supple \Sup"ple\, v. t. [imp. & p. p. Suppled; p. pr. & vb. n. Suppling.]

  1. To make soft and pliant; to render flexible; as, to supple leather.

    The flesh therewith she suppled and did steep.
    --Spenser.

  2. To make compliant, submissive, or obedient.

    A mother persisting till she had bent her daughter's mind and suppled her will.
    --Locke.

    They should supple our stiff willfulness.
    --Barrow.

Wiktionary
suppling

vb. (present participle of supple English)