noun
very spacious hall; grand space
Describes an extremely large room or hall, often used in the names of banquet halls, inns, or event spaces. The literal meaning is 'thousand-tatami area'.
この旅館には千畳敷の大広間がある。
This inn has a very spacious banquet hall.
noun
large flat bedrock terrain; vast rock plateau
Refers to a wide, flat expanse of bedrock, often a scenic natural feature. Common in place names, e.g., 千畳敷海岸 in Aomori or 千畳敷カール in the Japanese Alps.
千畳敷海岸は、広大な岩棚が続く景勝地だ。
Senjōjiki Coast is a scenic spot with a vast stretch of rock shelves.