Webster’s Revised Unabridged Dictionary · 1913
Subsign
Sub·sign′ (sŭb·sīn′), v. t. [imp. & p. p. Subsigned; p. pr. & vb. n. Subsigning.] [L. subsignare; sub under + signare to mark: cf. F. soussigner. See Sign.] To sign beneath; to subscribe. [R.] Camden.