晦日(みそか)

the last day of the month

大晦日(おおみそか)

New Year's Eve

晦(くら)ます

to conceal; to make disappear

晦渋(かいじゅう)

obscure; difficult to understand

晦冥(かいめい)

darkness; obscurity

晦日払(みそかばら)い

end-of-the-month payment

晦日蕎麦(みそかそば)

soba eaten at the end of the month

晦日正月(みそかしょうがつ)

New Year's observance held at the end of January

彼(かれ)の晦渋(かいじゅう)な文章(ぶんしょう)は、読者(どくしゃ)を困惑(こんわく)させた。

His obscure writing confused the readers.

大晦日(おおみそか)には、家族(かぞく)で年越(と)し蕎麦(こしそば)を食(た)べる。

On New Year's Eve, I eat year-crossing soba with my family.