From qebah; something tight, i.e. (figuratively) trouble -- distress, pain, strait.
see HEBREW qebah
H4712. metsar
מֵצַר noun [masculine] straits, distress; — absolute קָרָאתִי הַמֵּצַר מִןֿ Psalm 118:5; plural הַמְּצָרִים Lamentations 1:3 the distresses, of conquered Judah; construct שְׁאוֺל מְצָרֵי Psalm 116:3 the straits of Sheol, i.e. the worst possible ("" חֶבְלֵימָֿוֶת).