Definitions:

1. A high-pitched bark or chatter, often repetitive or annoying. NOUN
   • The constant yap of dogs in the distance kept her awake.
2. To bark sharply or make a high-pitched, repetitive noise, often used to describe small dogs or loud, trivial talking. VERB
   • He wouldn't stop yapping about his new car.
   • The little dog began to yap excitedly when the doorbell rang.

Synonyms:

• babble
• bark
• chatter
• gibber
• prattle
• trap
• yelp
• yip