Definitions:

1. Refers to the action of moving one's body, body part, or object back and forth in small motions, often rapidly or with a degree of vibration. VERB
   • The dog's tail began to waggle excitedly when it saw its owner.
2. To move or shake something with short, quick motions from side to side or up and down. VERB
   • She gave her fingers a playful waggle to warm him not to peek.

Synonyms:

• quiver
• shake
• twitch
• wag
• wave
• wiggle