long desk; long table
A desk or table that is notably long, often used in schools, offices, or meeting rooms.
会議室に長机を並べて資料を広げた。
We lined up long tables in the meeting room and spread out the materials.
Compound of 長 (naga, 'long') and 机 (tsukue, 'desk'), with rendaku voicing of つくえ to づくえ.