open air

Từ điển WordNet v3.1 - WordNet Dictionary

noun

where the air is unconfined
- he wanted to get outdoors a little
- the concert was held in the open air
- camping in the open
• Syn:
outdoors, out-of-doors, open
• Derivationally related forms:
open (for: open), outdoorsy (for: outdoors)
• Hypernyms:
outside, exterior