Definitions:

1. To emit high-pitched, musical tones, often repetitively. VERB
   • The canary tweedled happily in its cage.
2. To manipulate something, often in a trivial or inconsequential way. VERB
   • He sat there tweedling the radio knobs, trying to find a clear station.

Synonyms:

• adjust
• chirp
• fiddle
• tinkle
• trill