n.

a slipper that has no fitting around the heel

同義詞：mule

the act of scuffing (scraping or dragging the feet)

Scuffing Theory Modeling and Experimental Correlations
Anti-scuffing treatment for alkaline bottle washing systems
The anti-scuffing performance of diamond nano-particles as an oil additive
Scuffing and wear behavior of aluminum piston skirt coatings against aluminum cylinder bore
Infrared and Visual Study of the Mechanisms of Scuffing
A review of scuffing and running-in of lubricated surfaces, with asperities and oxides in perspective
The effect of various surface treatments on piston pin scuffing resistance
Abrasion, erosion and scuffing resistance of carbide and oxide ceramic thermal sprayed coatings for different applications
Electrostatic monitoring of oil lubricated sliding point contacts for early detection of scuffing
Detailed surface roughness characterization of engineering surfaces undergoing tribological testing leading to scuffing