zaczęli

third-person plural virile past of zacząć

Nou

to start, to begin (to do something previously not done)
to start (to enter the first stages of something)
to begin (to do something as the first of a series of actions)
to begin, to start (to take on a particular profession)
to begin (to open and start using something previously unused)
to begin (to say something at first and continue speaking afterwards)
to begin, to start (to gain a particular ability)
to start (to be the cause of conflict)
(obsolete) to enter pregnancy, to become pregnant
to start, to begin (of events, etc., to have a beginning; to be initiated)
to start, to begin (of places, etc., to have an edge; to be first seen somewhere)
to start, to begin (of periods, etc., to have the initial phase and continue to last)
to start, to begin (to be the first of a collection of events)