- frontier
- noun1 (BrE) border between countriesADJECTIVE▪ common▪
Neither country would guarantee the integrity of their common frontier.
▪ eastern, northern, etc.▪There were very few border controls on the south-western frontier.
▪ Franco-Spanish, French-Spanish, etc.VERB + FRONTIER▪ cross▪The army crossed the frontier in the middle of the night.
▪ reach▪ control, defend, guard▪The rebels control the frontier and the surrounding area.
FRONTIER + NOUN▪ controls, post▪ guard▪ zonePREPOSITION▪ across the frontier▪The weapons were smuggled across the frontier.
▪ along the frontier▪an army grouping along the frontier
▪ at the frontier▪There was an army checkpoint at the frontier.
▪ on the frontier▪people living on the German frontier
▪ over the frontier▪They were forced to retreat back over the frontier.
▪ frontier between▪the frontier between India and Pakistan
▪ frontier with▪France's frontier with Germany
2 the frontier the edge of land that is knownADJECTIVE▪ wild▪America's wild frontier
▪ westernVERB + FRONTIER▪ explore▪ tame▪ settleFRONTIER + NOUN▪ province, settlement, town▪ mentality, spirit3 border between what we know and do not knowADJECTIVE▪ final, last▪ new▪ next▪ technologicalVERB + FRONTIER▪ explore▪Space is the final frontier for us to explore.
▪ advance, expand, extend, open, push back▪The scientists' work will push back the frontiers of physics.
Collocations dictionary. 2013.