razor-sharp 
adjective
Extremely sharp: razor-sharp teeth figurative his razor-sharp mind...
- It's a biting attack on the media machine itself, and, as expected with Lee, this movie has a full set of razor-sharp teeth.
- Officers then secured the crocodile's mouth shut, protecting them from rows of razor-sharp teeth.
- We shall have to rely instead on the razor-sharp mind of Lord Hutton and the work of his inquiry.
- ring-key
- ring knocker
- ring kop
- ring laser
- onesteead
- one-step
- one step ahead
- one step forward and two steps back
- one-stop
- one-stress
- one-suiter
- one swallow does not make a summer
- one-tail
- one-tailed
- one-teacher school
- one thing after another
- one thing and another
- one thing leads to another
- one-time
- one time
- one-time cipher
- one-time pad
- one-time system
- one-to-one
- one-touch