auction block; bar; barricade; blank out; block off; block up; blockade; blockage; blocking; choke up; city block; close up; closure; cube; cylinder block; deflect; draw a blank; embarrass; engine block; forget; freeze; halt; hinder; immobilise; immobilize; impede; jam; kibosh; lug; mental block; obstruct; obturate; occlude; occlusion; parry; pulley; pulley block; pulley-block; stop; stoppage; stuff; stymie; stymy;