See on Mat 21:33. It may mean either a hedge, or a place enclosed with a hedge. Here the hedges beside which vagrants rest.
Compel
Compare constrained, Mat 14:22; Act 26:11; Gal 6:12. Not to use force, but to constrain them against the reluctance which such poor creatures would feel at accepting the invitation of a great lord.
May be filled (γεμισθῇ)
A very strong word; properly of loading a ship. “Nature and grace alike abhor a vacuum” (Bengel).