1Size; the dimensions of an object.
靴を買うときは大小をよく確かめたほうがいい。
When buying shoes, you should check the size carefully.
この容器は用途によって大小を選べる。
You can choose the size of this container depending on its use.
石の大小によって置き場所を変えている。
We change where the stones are placed depending on their size.
2A mix of large and small; various sizes (often as 大小さまざま, "all sizes").
倉庫には大小さまざまな箱が積まれている。
Boxes of all different sizes are stacked in the warehouse.
大小の石を組み合わせて庭を作った。
We made the garden by combining stones of various sizes.
3Daishō — the matched pair of long and short swords traditionally worn by a samurai.
武士は大小を腰に差して外出した。
The samurai went out with his daishō (matched long and short swords) at his waist.
4A set of drums of different sizes, such as a large and small taiko drum.
祭りのお囃子では大小の太鼓が使われる。
Drums of various sizes are used in the festival music.
5In the old lunar calendar, the distinction between long months (大) and short months (小).
旧暦の大小は毎年入れ替わるので、暦作りは複雑だった。
In the old calendar, which months were long or short changed every year, making the calendar-making process complex.
6Sic bo — a dice-based gambling game popular in casinos such as those in Macau.
マカオのカジノでは大小を楽しむ客が多い。
Many visitors enjoy playing sic bo at casinos in Macau.