Definition of もんげん
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(n) closing time; lockup; curfew
「なあ、寮の門限って何時だっけ?」「21時よ」「やばい、走らないと間に合わないぞ」
"Hey, when do the dorms lock up?" "9 o'clock" "Whoops, if we don't run we won't make it!"