Wiktionary
n. (context idiomatic English) The survival of the fittest, strongest or most cunning
Wikipedia
"The law of the jungle" is an expression that means "every man for himself," "anything goes," "survival of the strongest," " survival of the fittest," "kill or be killed," "dog eat dog" and "eat or be eaten,". The Oxford English Dictionary defines the Law of the Jungle as "the code of survival in jungle life, now usually with reference to the superiority of brute force or self-interest in the struggle for survival.""Law of the Jungle." Oxford English Dictionary Online. Oxford University Press.
n.d. Web. 10 May 2013. It is also known as jungle law or frontier justice.
The phrase was used in a poem by Rudyard Kipling to describe the obligations and behaviour of a wolf in a pack. However, this use of the term has been overtaken in popularity by the other interpretations above.
Law of the Jungle is a 1942 American film directed by Jean Yarbrough.
Law of the Jungle is a South Korean reality- documentary show on SBS. It was first aired on October 21, 2011. This show is a hybrid of reality-variety television, natural documentaries, and human drama; a new concept of programming. The cast of celebrities travel to less-habitated, natural places to survive on their own and experience life with local tribes and people. Originally airing at the Friday 11:05 pm KST time slot, the program was switched into Good Sunday beginning May 6, 2012, airing before Running Man at the 5:00 pm time slot, replacing K-pop Star Season 1. With the return of K-pop Star Season 2 to Good Sunday, the program returned to Friday nights but airing at 10:00 pm instead beginning November 16, 2012. Originally airing as Kim Byung-man's Law of the Jungle after the creator and "clan leader" Kim Byung-man, "Kim Byung-man's" was dropped from the title after episode 40.
Special editions of the program air as well featuring a different cast not in the regular time slot. Law of the Jungle W (W for Women) features an all-female cast and generally airs during the Seollal and Chuseok holidays. Law of the Jungle K (K for Kids) features celebrities with their children, and has aired as a Korean New Year special in 2013.
Usage examples of "law of the jungle".
In the jungle he becomes weakened, civilization recedes, and with his death the law of the jungle prevails.
The law of the jungle, he had learned, was to shoot first and investigate afterward.
He had entered the lists in mortal combat and true to the primitive instincts of the wild -- the unwritten law of the jungle -- one or both must die before the battle ended.
For it is my right, by the Law of the Jungle, that ye come one by one.