Solutions At a boundary or threshold has 11 entries with similar clues
- abutTo have a common boundary with
- edgeBoundary
- edgyBoundary-pushing
- limitBoundary
- brinkThreshold
- hedgeBoundary
- liminalOn the threshold of consciousness
- doorstepThreshold stair
- perimeterOuter boundary of an area
- open-endedHaving no predetermined limit or boundary
- event-horizonIn astronomy, boundary of a black hole