Definitions

1. verb

to speak or sing in a foolish or annoyingly cheerful manner

“The children tweedled excitedly as they waited for the parade.”

2. noun

a foolish or annoyingly cheerful sound, especially one made by a person

“The tweedle of the laughter echoed through the room.”

3. noun

the second and fourth syllables in a nursery rhyme, especially the one beginning ‘Tweedledee, tweedledum’

“The children recited the nursery rhyme with the correct tweedle.”