This is the 76th most frequent Estonian word.
ju
"Ju" is a particle in Estonian used to emphasize something already known, obvious, or self-evident.
Here, 'ju' adds an explanatory tone to the statement, stressing that the fact described is commonly acknowledged.
Ta on ju alati täpne.
She is always punctual, you know.
In this usage, 'ju' is used to emphasize that the action or statement in question had already been addressed, adding a reminder or reinforcing nuance.
Ma ju ütlesin, et vihmavarju on vaja.
I did tell you that we would need an umbrella.
In this sentence, 'ju' is used as an affirming particle that implies the speaker believes the listener already knows this information.