ra ‧ zor /ˈreɪzə $ -ər/ BrE AmE noun
[ Date: 1200-1300 ; Language: Old French ; Origin: raseor , from raser ; ⇨ ↑ raze ]
1 . [countable] a tool with a sharp blade, used to remove hair from your skin ⇨ shaver :
an electric razor
a disposable razor
2 . be on a razor/razor’s edge British English to be in a difficult position where a mistake could be dangerous:
Politically we are on a razor edge.