noun
Refers to a small piece of furniture for sitting, often a bathroom bench or a simple seat. The cross-reference to 腰掛け suggests it is a compound emphasizing the object as a seating platform.
See also: 腰掛け
浴室に腰掛け台を置いて、座って体を洗えるようにした。
I placed a small bench in the bathroom so I can sit down while washing myself.
玄関に腰掛け台があると、靴を履くときに便利だ。
Having a small seat in the entrance is convenient when putting on shoes.
腰掛け is a more general term for a stool or seat, while 腰掛け台 explicitly emphasizes the object as a platform or bench-like piece of furniture.
Compound of 腰掛け (stool, seat) and 台 (platform, stand). The exact historical derivation is uncertain, but the word transparently means 'sitting platform'.