barking while retreating
Rare term describing a dog or similar animal that barks as it runs away, often used figuratively for someone who talks tough but backs down.
逃げ吠え can refer to an attitude like a losing dog howling from a distance.
Compound of 逃げ (nige, 'fleeing') and 吠え (hoe, 'barking'). The exact origin is uncertain; it is a rare expression.