expression
come out!; where are you?
A gentle, coaxing imperative used when calling someone to come out, often to a child or someone close. The second gloss 'where are you?' reflects a usage where the speaker is looking for someone and calls them to appear.
隠れているなら、出ておいで。
If you're hiding, come out.
どこにいるの？出ておいで。
Where are you? Come out.
From 出て (te-form of 出る 'to come out') + おいで (a polite or gentle imperative form of 来る 'to come', often used with children or close acquaintances).