不及物动词

1. (鸟)啭鸣，啁啾
When a bird warbles, it sings pleasantly.

2. 用颤音唱
If someone warbles, they sing in a high-pitched, rather unsteady voice.

3. (电话等)发出颤音
When machines such as telephones warble, they make high-pitched sounds.

1. a lumpy abscess under the hide of domestic mammals caused by larvae of a botfly or warble fly