frontier : Idioms & Phrases
Flanks of a frontier
- salient points in a national boundary, strengthened to protect the frontier against hostile incursion.
Webster 1913
frontier settlement
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noun a settlement on the frontier of civilization
outpost.
WordNet
last frontier
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noun a state in northwestern North America; the 49th state admitted to the union
AK; Alaska.
- Alaska is the largest state in the United States
WordNet
triple frontier
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noun the border area where Argentina and Brazil and Paraguay meet; an active South American center for contraband and drug trafficking and money laundering; a suspected locale for Islamic extremist groups