この間
このあいだ · konoaida · JLPT N4 · noun
day
📅 この間 = this + interval: the stretch of time just behind us
この means this and 間 (あいだ) means gap or interval. Literally this interval, it names the short span between then and now, so it came to mean the other day or recently. The same 間 appears in 時間 (time) and 昼間 (daytime).