This is the 16786th most frequent Russian word.
случилась
"Sluchilas'" means "happened."
The word 'случилась' is the past tense, feminine form of the verb 'случиться', meaning 'to happen'. Here, it is used to indicate that an incident (авария) occurred.
Вчера случилась авария на дороге.
Yesterday, an accident happened on the road.
The word 'случилась' refers to the occurrence of an event (встреча), expressing that it happened spontaneously or unexpectedly.
На нашем празднике случилась неожиданная встреча старых друзей.
An unexpected reunion of old friends happened at our celebration.
'Случилась' is used to describe the happening of a natural event (буря), emphasizing its suddenness or natural cause.