passing through, in transit
Он бывает у родителей заездом, раз в год.
He stops by his parents' place only once a year.
Мы были в Казани только заездом, на пару часов.
We were only passing through Kazan, for a couple of hours.
Заездом заглянули к друзьям и поехали дальше.
We stopped by our friends' place and then continued on.
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