How to translate て-form + ろ


In the Japanese exclamation:

> 待ってろよ！

What function does ろ have and how should it be translated to English? I've
searched everywhere, but I can't seem to find a decent explanation. The only
thing that came close was a website telling me that the て-form could sometimes
be replaced by a ろ, but that's not what's happening here..




This is a shortening of 待っていろ which is imperative for 待っている (いろ being the
imperative of いる)




This is a shortening of 待っていろ which is imperative for 待っている (いろ being the
imperative of いる)

