Tradução de "High up

Olá, Gostaria de saber qual seria a melhor tradução para High up. Se é considerada uma Pharasal verb.
Este é o nome de uma coleção de livro didático de inglês e mesmo sendo professora ainda tenho algumas dúvidas quanto a melhor para estas expressões.
Agradeço a colaboração.

Fica dificil saber sua traduçao pois nao tem um contexto mas vou da alguns frases de uso:
in a high position above the ground
The phone is too high up on the wall for the kids to reach.
Someone who is high up in an organization has an important position in it.
Her husband was quite high up in the navy.
On a drug like heroine, cocaine, ecstacy. Usually shortened to high. Usually people high up will exagerate emotions, so a small liking, can become love, and a small disapproval, can become total hate/disgust.
http://www.urbandictionary.com/define.php?...high%20up
http://www.macmillandictionary.com/dictionary/.../high-u...
[url]dictionary.cambridge.org/dictionary/british/high-up[/url]
I hope I've helped you.

"High up" has a ring of "no alto (de), no topo (em importância ou literalmente lá em cima, no ar etc), these are some concepts that comes to mind, right now. It could also be something of importante and necessary.

You can use high up and make a search on Linguee, Bab.la, or Google and have some good hits.