ra·zor 
/ˈreɪzɚ/ noun
plural ra·zors /ˈreɪzɚ/ noun [count] : a tool or device with a sharp edge that is used to shave or cut hair from the face, body, or head
▪ an electric razor ▪ a disposable/safety razor — see picture at grooming
▪ an electric razor ▪ a disposable/safety razor — see picture at grooming
razor's edge or razor edge
— used in various phrases to refer to a dangerous position or a position in which two different things are carefully balanced ▪ He's a thrill-seeker who likes living on the razor's edge. ▪ The country's future is balanced on a razor's edge. ▪ He walks a/the razor edge [=walks a/the fine line] between humor and bad taste in his comedy.
