| Main Entry: | |
| Part of Speech: | noun |
| Definition: | obstruction |
| Synonyms: | bar, barricade, blank wall, blockade, bound, boundary, confines, curtain, ditch, enclosure, fence, fortification, gully, hurdle, impediment, limit, moat, obstacle, pale, palisade, railing, rampart, roadblock, stop, trench, wall |
| Antonyms: | opening |
| Main Entry: | barricade |
| Part of Speech: | noun |
| Definition: | blocking object |
| Synonyms: | bar, barrier, blank wall, block, blockade, bulwark, fence, obstruction, palisade, rampart, roadblock, stockade, stop, wall |
| Antonyms: | opening |
| Main Entry: | block |
| Part of Speech: | noun |
| Definition: | obstruction |
| Synonyms: | bar, barrier, blank wall, blockage, chunk, clog, hindrance, impediment, jam, mass, obstacle, obstruction, roadblock, snag, stop, stoppage, wall |
| Notes: | a bloc is a group of countries in special alliance while a block is an obstruction, an interruption, or a rectangular area or shape |
| Antonyms: | opening |
| Main Entry: | bottleneck |
| Part of Speech: | noun |
| Definition: | obstacle |
| Synonyms: | barrier, block, blockage, clog, congestion, hindrance, hold-up, impediment, jam, obstruction, snag, traffic jam |
| Main Entry: | boundary |
| Part of Speech: | noun |
| Definition: | outer limit |
| Synonyms: | abuttals, ambit, barrier, beginning, border, borderland, borderline, bounds, brink, circumference, circumscription, compass, confines, edge, end, environs, extent, extremity, frame, fringe, frontier, hem, horizon, limits, line, line of demarcation, march, margin, mark, mere, mete, outline, outpost, pale, perimeter, periphery, precinct, purlieus, radius, rim, side, skirt, terminal, termination, terminus, verge |
| Antonyms: | inside, interior, minimum |
| Main Entry: | bulwark |
| Part of Speech: | noun |
| Definition: | fortification, support |
| Synonyms: | barrier, bastion, buffet, buttress, citadel, defense, embankment, fort, fortress, guard, mainstay, outwork, parapet, partition, protection, rampart, redoubt, safeguard, security, stronghold, vallation |
| Antonyms: | weak point |
| Main Entry: | curb |
| Part of Speech: | noun |
| Definition: | restraining device; check |
| Synonyms: | barrier, border, brake, bridle, chain, control, deterrent, edge, harness, hindrance, ledge, limitation, lip, rein, restrainer, restraint, restriction, rim |
| Antonyms: | encouragement, opening |
| Main Entry: | dam |
| Part of Speech: | noun |
| Definition: | embankment, wall |
| Synonyms: | bank, barrage, barrier, dike, ditch, gate, grade, hindrance, levee, milldam, millpond, obstruction, weir |
| Notes: | a dam is a barrier constructed to contain the flow of water while damn is used as an expletive meaning cursed, condemned to hell |
| Main Entry: | embargo |
| Part of Speech: | noun |
| Definition: | prohibition, restriction |
| Synonyms: | ban, bar, barrier, blockage, check, hindrance, impediment, interdict, interdiction, proscription, restraint, stoppage |
| Notes: | a boycott is an organized popular protest, while an embargo is usually imposed by a government |