This is the 933rd most frequent Czech word.
hráli
"hráli" = "they played"
The word 'hráli' is used here as the past tense of the verb 'hrát' (to play) to describe an activity performed in the past by a group (we) involving a sport.
Včera jsme hráli fotbal.
Yesterday, we played football.
Here, 'hráli' indicates the past activity of playing by the subject (the children), emphasizing free play or leisure.
Děti si venku hráli na hřišti.
The children played outside on the playground.
In this context, 'hráli' refers to the performance of music using instruments in the past by an unspecified group of people.