This is the 11477th most frequent Polish word.
jechali
"Jechali" means "they were driving" or "they were riding" in English.
The word 'jechali' is a past tense, masculine or mixed gender plural form of the verb 'jechać', meaning 'to go' or 'to travel' by vehicle.
Wczoraj jechali do szkoły autobusem.
Yesterday, they were traveling to school by bus.
Here 'jechali' describes an ongoing action in the past where a group was in motion using a vehicle.
Gdy jechali na wycieczkę, padał deszcz.
As they were traveling on the trip, it was raining.
In this sentence, 'jechali' indicates the act of moving slowly using a transport method in the past by mixed or masculine plural subjects.