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rebuff (v.)

1580s, from obsolete French rebuffer "to check, snub," from Italian ribuffare "to check, chide, snide," from ribuffo "a snub," from ri- "back" (from Latin re-, see re-) + buffo "a puff," of imitative origin (compare buffet (v.)). Related: Rebuffed; rebuffing.

rebuff (n.)

1610s, from rebuff (v.), or from French rebuffe or Italian ribuffo.

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Definitions of rebuff from WordNet
1
rebuff (v.)
reject outright and bluntly;
Synonyms: snub / repel
rebuff (v.)
force or drive back;
rebuff the attack
Synonyms: repel / repulse / fight off / drive back
2
rebuff (n.)
a deliberate discourteous act (usually as an expression of anger or disapproval);
Synonyms: slight
rebuff (n.)
an instance of driving away or warding off;
Synonyms: snub / repulse
From wordnet.princeton.edu