Anger

v. make angry; irritate

n. wrath, rage, fury

Anger is part of the fight/flight brain response to the perceived threat of pain. When a person makes the cognitive choice to take action to immediately stop the threatening/painful behavior of another (person or organization, or any outside force) anger (as opposed to fear) becomes the predominant feeling, with behavioral, cognitive and physiological correlates. In the animal kingdom, when physically threatened, animals will make loud sounds, attempt to look physically larger, bare their teeth, and stare. Humans behave in a similar manner when a perception of potential pain occurs, and the decision to oppose (rather than flee) occurs. Anger is a behavioral pattern designed to communicate "Stop your behavior immediately, it is harmful or threatening- If you don't, violence towards you may follow." Rarely (if ever) does a physical altercation occur without the prior expression of anger by at least one of the participants.
See more at Wikipedia.org...

Noun
1. a strong emotion; a feeling that is oriented toward some real or supposed grievance
(synonym) choler, ire
(hypernym) emotion
(hyponym) fury, rage, madness
(derivation) see red
2. the state of being angry
(synonym) angriness
(hypernym) emotional arousal
(hyponym) rage
(derivation) see red
3. belligerence aroused by a real or supposed wrong (personified as one of the deadly sins)
(synonym) wrath, ire, ira
(hypernym) mortal sin, deadly sin
(derivation) see red
Verb
1. make angry; "The news angered him"
(hypernym) arouse, elicit, enkindle, kindle, evoke, fire, raise, provoke
(hyponym) combust
(cause) see red
(derivation) angriness
2. become angry; "He angers easily"
(synonym) see red
(hypernym) feel, experience
(hyponym) steam
(derivation) angriness

n. green, grassy area, piece of grassy public land near or in a village

(v. t.)
To make painful; to cause to smart; to inflame.
  

(v. t.)
To excite to anger; to enrage; to provoke.
  

(n.)
Trouble; vexation; also, physical pain or smart of a sore, etc.
  

(n.)
A strong passion or emotion of displeasure or antagonism, excited by a real or supposed injury or insult to one's self or others, or by the intent to do such injury.