What is Breach Of The Peace?

Legal Definition
Breach of the peace, or disturbing the peace, is a legal term used in constitutional law in English-speaking countries, and in a wider public order sense in the several jurisdictions of the United Kingdom.
-- Wikipedia
Legal Definition
A violation of public order; the offence of disturbing the public peace. One guilty of this offence may be held to bail for his good behaviour. An act of public indecorum is also a breach of the peace. The remedy for this offence is by indictment. Vide Pace,
-- Bouviers Law Dictionary
Legal Definition
A violation of the public tranquillity and order. The offence of breaking or disturbing the public peace by any riotous, forcible, or unlawful proceeding. 4 Bl. Comm. 142, et seq.; People v. Bartz, 53 Mich. 493, 19 N. W. 161; State v. White, 18 R. I. 473, 28 Atl. 968; People v. Wallace, 85 App. Div. 170, 83 N. Y. Supp. 130; Scougale v. Sweet, 124 Mich. 311, 82 N. W. 106L

A constructive breach of the peace is an unlawful act which, though wanting the elements of actual violence or injury to any person, is yet inconsistent with the peaceable and orderly conduct of society. Various kinds of misdemeanors are included in this general designation, such as sending challenges to fight, going armed in public without lawful reason and in a threatening manner, etc. An apprehended breach of the peace is caused by the conduct of a man who threatens another with violence or physical injury, or who goes about in public with dangerous and unusual weapons in a threatening or alarming manner, or who publishes an aggravated libel upon another, etc.
-- Black's Law Dictionary
Legal Definition
Any act disturbing the peace, quiet or good order of a neighborhood. See 13 L. R. A. 163; also 24 Am. St. Rep. 116.
-- Ballentine's Law Dictionary