צַר tsar (H6862)

narrow; (as a noun) a tight place (usually figuratively, i.e. trouble); also a pebble ; (transitive) an opponent (as crowding)

1) narrow, tight 2) straits, distress 3) adversary, foe, enemy, oppressor 4) hard pebble, flint

or צָר; from צָרַר (H6887); compare as in צֹר (H6864)