lost child; lost person; stray child
Refers to a child (or by extension any person) who has become separated from their group or guardian and cannot find their way. Commonly used in public announcements and everyday situations.
I got lost in the department store.
We have an announcement for a lost child.
The station staff helped a parent who was searching for their lost child.
The police took a lost child into custody at the park.
lost child center; lost and found for children