reduplicate

transitive verb reduplicated, reduplicating

1. to redouble, double, or repeat
2. 1. to double (a root syllable or other element) so as to form an inflected or derived form of a word (as tom-tom), sometimes with certain changes, as of the vowel (as in chitchat)
   2. to form (words) by such doubling

intransitive verb

adjective

1. reduplicated; doubled
2. valvate (sense )

noun