This is the 93rd most frequent Finnish word.
jäi
"Jäi" means "stayed," "was left," or "remained."
Here, 'jäi' means 'stayed' and indicates remaining in a location.
Hän jäi kotiin tekemään läksyjä.
He stayed home to do homework.
In this context, 'jäi' implies that the car ended up immobile in a certain place.
Auto jäi keskelle tietä.
The car got stuck in the middle of the road.
In this example, 'jäin' (first person singular form of 'jäi') shows someone continuing to reflect on or think about something.