To block up; stop up or close, as a way or passage; fill with obstacles or impediments that prevent passing.To hinder from passing; stop; impede in any way; check.To retard; interrupt; delay: as, progress is often obstructed by difficulties, though not entirely stopped.Synonyms To bar, barricade, blockade, arrest, clog, choke, dam up, embarrass, See obstacle.n. An obstruction.