baffle balk bar barricade blast block block up blockade bolt brave challenge checkmate chock choke choke off circumvent close close off close tight close up confound confront constrict contravene counter counteract countermand counterwork cross crowd dash debar defeat defy destroy discomfit disconcert discountenance dish disrupt dog elude flummox foil frustrate jam knock the chocks lock nonplus obstruct occlude pack perplex ruin sabotage scotch shut off shut out shut tight spike spoil squeeze squeeze shut stifle stonewall stop up strangle strangulate stump suffocate thwart upset