This is the 94th most frequent Czech word.
kolem
"Around" or "near."
In this sentence, 'kolem' is used as a preposition indicating movement or location in the vicinity or surrounding area of the object, here being 'dům' (house).
Šel kolem domu.
He walked around the house.
Here, 'kolem' again acts as a preposition denoting movement encircling 'strom' (tree).
Běhali kolem stromu.
They were running around the tree.
'Kolem' in this sentence is employed to signify an approximate time, illustrating its usage in expressing estimation or proximity temporally.