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BNC: 34747 COCA: 33541

roughen

1 ENTRIES FOUND:
roughen /ˈrʌfən/ verb
roughens; roughened; roughening
roughen
/ˈrʌfən/
verb
roughens; roughened; roughening
Learner's definition of ROUGHEN
: to become rough or cause (something) to become rough使变粗糙(或不平整)
[+ object]
[no object]

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