semi-double bed; three-quarter bed
Refers to a bed size between a single and a double, common in Japanese hotels. Often used in the compound セミダブルベッド.
wasei-eigo (Japanese-coined English), from semi-double
See also: セミダブルベッド
This hotel room has a semi-double bed.
A semi-double is spacious enough for one person to sleep in.
Wasei-eigo derived from English 'semi-double', referring to a bed size between single and double.