Double; twofold or consisting of two parts—having twice the usual amount or two of something.
このサイズはシングルかダブルか選んでください。
Please choose whether you want the single or double size.
カフェでコーヒーをダブルで頼んだら、ショットが二つ入っていた。
I ordered a double coffee at the café and it had two shots.
その選手は初戦でダブルを失敗してしまった。
The player made a double fault in the first match.
Abbreviation for a double bed; a hotel room or bed that is larger than a single bed.
出張なのでホテルでダブルの部屋を予約した。
I reserved a double room at the hotel for my business trip.
二人で泊まるならダブルのベッドが便利だ。
If two people stay, a double bed is convenient.
Abbreviation for double-breasted (as in coats or jackets) — a garment with overlapping front flaps and two parallel columns of buttons.
彼はダブルのコートを着て出かけた。
He went out wearing a double-breasted coat.
Refers to double-cuffed (i.e., cuffs folded or double-layered) garments; 'double' indicating a doubled cuff.
フォーマルなシャツでダブルのカフスはよく見られる。
Double cuffs are often seen on formal shirts.
Double width (of cloth), commonly around 1.42 meters; a textile term indicating the fabric's width.
この生地はダブル幅なので、ワンピースを一本取るのに便利だ。
This fabric is double width, so it's convenient for cutting out a dress in one piece.
Doubles (in sports), i.e., events played by pairs (in tennis, badminton, etc.).
今年はテニスのダブル（ダブルス）に出場する予定だ。
This year I plan to enter the tennis doubles (doubles match).
(Rare) A term for a biracial or mixed-heritage person; sometimes used as an alternative to 'half' but its use is contentious.
一部のメディアでは『ダブル』という表現で混血の出自を紹介することがあるが、当事者の意見はさまざまだ。
Some media sometimes describe mixed-heritage people as 'double,' but opinions among those concerned vary.