numeric
The native Japanese numeral for eight, used for counting general items with the counter つ.
りんごを八つください。
Please give me eight apples.
箱の中にボールが八つある。
There are eight balls in the box.
noun
eight years old
Used to state a child's age, typically for young children. The counter つ is traditionally used up to nine years old.
娘は今年八つになります。
My daughter will be eight years old this year.
noun
In the old Japanese temporal hour system, the day was divided into twelve periods, each named after an animal. 八つ corresponded to approximately 2 a.m. or 2 p.m., depending on the season. This usage is now historical.
江戸時代には、八つ時におやつを食べる習慣があった。
In the Edo period, there was a custom of eating a snack at the hour of the 'yatsu' (around 2 p.m.).