10. [Perhaps a different word.] A fixed seat or shelf. [Prov. Eng.]

Sconce, v. t. [imp. & p. p. Sconced (?); p. pr. & vb. n. Sconcing.] 1.

To shut up in a sconce; to imprison; to insconce. [Obs.]

Immure him, sconce him, barricade him in 't.