noun
third watch of the night (approx. 11pm to 1am)
Historical timekeeping term from the old Chinese-influenced system dividing the night into five watches. Rare in modern Japanese outside historical or literary contexts.
昔の時刻では、三更は夜の11時から1時ごろにあたる。
In the old time system, the third watch corresponds to around 11 p.m. to 1 a.m.