榻 originally meant a long, narrow, low couch used for sitting and napping in classical Chinese homes — see 《
玉台新咏》 'move my crystal couch /
移我琉璃榻'. The radical
木 (wood) shows it was a piece of wooden furniture. Today
榻 is mostly literary, surviving in compounds:
病榻 (sickbed),
卧榻 (bed),
下榻 (to lodge / put up at).
