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razor

razor /ˈreɪzɚ/ noun
plural razors
razor
/ˈreɪzɚ/
noun
plural razors
Britannica Dictionary definition of RAZOR
[count]
: a tool or device with a sharp edge that is used to shave or cut hair from the face, body, or head 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