BRISTLE

A stiff fiber (coarse hair or filament)

• Betray discontentment

• Brush component

• Brush material

• Brush part

• Dartboard bit

• Display irritation

• Get angry and defensive

• Get one's back up

• React angrily

• React in an angry way

• Show irritation

• Stand up

• Stiffen with resentment

• Take offense

• Tense up

• Natural or synthetic

• A stiff hair