Definition of floss verb from the Oxford Advanced Learner's Dictionary

 

floss

 verb
verb
BrE BrE//flɒs//
 
; NAmE NAmE//flɔːs//
 
, NAmE//flɑːs//
 
Verb Forms present simple I / you / we / they floss
BrE BrE//flɒs//
 
; NAmE NAmE//flɔːs//
 
, NAmE//flɑːs//
 
he / she / it flosses
BrE BrE//ˈflɒsɪz//
 
; NAmE NAmE//ˈflɔːsɪz//
 
, NAmE//ˈflɑːsɪz//
 
past simple flossed
BrE BrE//flɒst//
 
; NAmE NAmE//flɔːst//
 
, NAmE//flɑːst//
 
past participle flossed
BrE BrE//flɒst//
 
; NAmE NAmE//flɔːst//
 
, NAmE//flɑːst//
 
-ing form flossing
BrE BrE//ˈflɒsɪŋ//
 
; NAmE NAmE//ˈflɔːsɪŋ//
 
, NAmE//ˈflɑːsɪŋ//
 
 
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[intransitive, transitive] floss (something) to clean between your teeth with dental floss Word Origin mid 18th cent.: from French (soie) floche ‘floss (silk)’, from Old French flosche ‘down, nap of velvet’, of unknown origin.
See the Oxford Advanced American Dictionary entry: floss