go off the deep end

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go off the deep end

1. Literally, to jump into the deep end of a pool (as opposed to the shallow end). Don't let Sally go off the deep end—she doesn’t know how to swim.
2. slang To become crazy or irrational. A; "Now your father thinks the neighbors are plotting against him." B: "Wow, he's really gone off the deep end!" Whoa, man, stop yelling! I only put a tiny scratch on your car, so there's no need to go off the deep end.
See also: deep, end, go, off
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

go off the deep end

 and jump off the deep end 
1. Lit. to jump into a swimming pool where the water is over one's head and one needs to be able to swim You are still only learning to swim. Are you ready to go off the deep end? He jumped off the deep end where he would make a bigger splash.
2. Fig. to become deeply involved (with someone or something) before one is ready. (Applies especially to falling in love.) Look at the way Bill is looking at Sally. I think he's about to go off the deep end.
3. Fig. to act irrationally, following one's emotions or fantasies. Now, John, I know you really want to go to Australia, but don't go jumping off the deep end. It isn't all perfect there.
See also: deep, end, go, off
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

go off the deep end

1. Become unduly excited, overwrought, or angry. For example, When he heard about John's smashing into his car, he went off the deep end. [c. 1920] Also see in deep, def. 2.
2. Be irrationally carried away, act irresponsibly or heedlessly. For example, Just because you like her looks doesn't mean you should go off the deep end and propose. [c. 1920] In both of these colloquial usages deep end alludes to the deep end of a swimming pool.
See also: deep, end, go, off
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

go off the deep end

mainly AMERICAN
1. If someone goes off the deep end, they start to behave in a crazy or very extreme way. Ray gives a chilling performance as the seemingly nice cop who goes off the deep end and starts terrorising a couple. At first they thought that I'd gone off the deep end and had lost my mind.
2. If someone goes off the deep end, they become very angry. My dad went off the deep end when he found out what I'd done. Note: The deep end is the end of a swimming pool where the water is deepest.
See also: deep, end, go, off
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

go off (or go in off) the deep end

give way immediately to anger or emotion. informal
This expression refers to the deep end of a swimming pool, where the diving board is located. In the USA the phrase has also developed the meaning ‘go mad’, but in either sense the underlying idea is of a sudden explosive loss of self-control.
See also: deep, end, go, off
Farlex Partner Idioms Dictionary © Farlex 2017

go off the ˈdeep end

(informal) suddenly become very angry or emotional: Don’t tell your father that you lost the money — he’ll just go off the deep end.
See also: deep, end, go, off
Farlex Partner Idioms Dictionary © Farlex 2017

go off the deep end

in. to do or experience something in the extreme: to fall madly in love, to go crazy, to commit suicide, to fly into a rage, etc. I saw what he had done, and I just went off the deep end. I was in a blind rage and didn’t know what I was doing.
See also: deep, end, go, off
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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References in classic literature ?
Some shady trees leaned over it, and rushes and water-lilies grew at the deep end. Over the hedge on one side we looked into a plowed field, and on the other we looked over a gate at our master's house, which stood by the roadside; at the top of the meadow was a grove of fir trees, and at the bottom a running brook overhung by a steep bank.
Mia swam towards the deep end of the river and was swallowed by the water.
Located in downtown Naperville, Centennial Beach features a sandy beach, zero-depth entry, water features and a slide at the shallow end and piers, diving boards and deep water swimming at the deep end.
He badly needed game time when he returned north of the border last month and was flung in at the deep end with three losses to Celtic before helping Saints to a scoreless draw at Ibrox.
The on-loan Brighton man was thrown in at the deep end yesterday, making his debut despite having never met his teammates prior to arriving at the ground on Sunday morning.
NCIS FOX, 9pm Gibbs (Mark Harmon, left) is thrown in the deep end as the drama returns for its 16th season.
Bellamy then added that the "deep end" of coaching players of varying ages -- from nine-year-olds to 18-year-olds -- at Cardiff was helping his own development as a manager.
Bellamy then added that the "deep end" of coaching players of varying ages from nine-year-olds to 18-year-olds at Cardiff was helping his own development as a manager.
Wambua Kawetha's relatives said the bulls, which were pulling a cart, got to the deep end of the water reservoir at Kwa-Ngonde.
Summary: Indian legend feels throwing youngsters in deep end is a good thing
HE was, by Sam Allardyce's own admission, thrown in at the deep end - one of very few players to make their competitive debut in English league football at Wembley.
Rio 2016 silver medallist Joyce has taken a risky fight with proven heavyweight Ian Lewison at London's Indigo at The 02, but despite him doing so, Page is wary of the "deep end" that undermined McGregor in August against Floyd Mayweather.
Deep End Games has released a new trailer for its upcoming survival horror game, "Perception." The developer also confirmed that the game will launch on May 30 for the PlayStation 4, Xbox One and the PC.
Joanna leaves her successful career in London to take over the running of the huge Attadale estate from her parents, finding herself in at the deep end at the Highland Games.
Leesa Freeman; INTO THE DEEP END; Pimpernel Publishing (Fiction: General) 14.95 ISBN: 9780986398605