The Collaborative International Dictionary of English v.0.48:
Supple \Sup"ple\, v. t. [imp. & p. p. Suppled (s[u^]p"p'ld);
p. pr. & vb. n. Suppling (s[u^]p"pl[i^]ng).]
1. To make soft and pliant; to render flexible; as, to supple
The flesh therewith she suppled and did steep.
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.