duff - definition and synonyms

verb 

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/dʌf/
present tense
I/you/we/theyduff
he/she/itduffs
present participleduffing
past tenseduffed
past participleduffed

phrasal verb

duff up

[transitive]
present tense
I/you/we/theyduff up
he/she/itduffs up
present participleduffing up
past tenseduffed up
past participleduffed up
British informal
to hurt someone by hitting or kicking them many times