knife's edge
Blade's sharpened margin
A knife's edge is the sharp cutting side of a blade, but the phrase appears most often in figurative expressions about precariousness or fine margins.
If something is on a knife's edge, it could go either way—success or failure, safety or danger—with very little separating the two outcomes.
The image captures how thin the difference is between opposing possibilities, like balancing on something impossibly narrow.
Flat cutting edge
- razorBlade for removing hair
- honedSharpened or refined
- keenSharp or enthusiastic
- whettedMade more acute
cutting · incisive · stropped · ground · piercing · trenchant · scalpel-like · lancet
Critical boundary point
- precipiceSteep rock face
- tightropeTaut cord for walking
- razor-thinExtremely narrow or slight
- cliffhangerSuspenseful unresolved ending
teetering · verge · threshold · cusp · hair's breadth · fine line · balancing act · touch and go
Relating to operations
- exactingDemanding great care
- fine-tunedPrecisely calibrated for optimal results
- meticulousShowing extreme attention to detail
- delicateEasily broken or harmed
hairline · exact · calibrated · measured · refined · pinpoint · controlled · deft
Anxious uncertainty about outcomes
- anxietyPersistent apprehensive distress
- nail-bitingExtremely tense or anxious
- nerve-wrackingCausing extreme anxiety
- uncertaintyState of being unsure
apprehension · high-stakes · drama · anticipation · unease · white-knuckle · breathless · fraught
blade
Flat cutting edge
whetted · cutting · incisive · stropped · ground · piercing · trenchant · scalpel-like · lancet
brink
Critical boundary point
- precipiceSteep rock face
- tightropeTaut cord for walking
- razor-thinExtremely narrow or slight
cliffhanger · teetering · verge · threshold · cusp · hair's breadth · fine line · balancing act · touch and go · critical point
surgical
Relating to operations
- exactingDemanding great care
- fine-tunedPrecisely calibrated for optimal results
- meticulousShowing extreme attention to detail
delicate · hairline · exact · calibrated · measured · refined · pinpoint · controlled · deft · accurate
suspense
Anxious uncertainty about outcomes
- anxietyPersistent apprehensive distress
- nail-bitingExtremely tense or anxious
- nerve-wrackingCausing extreme anxiety
uncertainty · apprehension · high-stakes · drama · anticipation · unease · white-knuckle · breathless · fraught · charged
- suspensesuspense, suspenseful, tension, nail-biter, nail-biting
knife's edgebreathing room
Space for relief
cushion · buffer · latitude · leeway · margin of error
knife's edgebluntness
Frank, unvarnished manner
dullness · flat surface · handle · rounded edge · soft edge
knife's edgesolid ground
Stable surface beneath
firm footing · safe harbor · sure thing · certainty · terra firma
knife, edge, knives, knifed, knifing, edges, edged, edging, edgy