Meaning of the word "attack dog" in English

What does "attack dog" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

attack dog

US /əˈtæk dɔːɡ/
UK /əˈtæk dɔːɡ/
"attack dog" picture

Noun

1.

a dog trained to attack on command or to defend a person or property

Example:
The security guard had an attack dog with him.
They trained the German Shepherd to be an effective attack dog.
2.

a person or group that aggressively criticizes or attacks an opponent, especially in politics or business

Example:
The senator's opponent used his campaign as an attack dog.
The media often portrays certain commentators as political attack dogs.
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