go off the deep end

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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, off

go off the deep end

to become so angry or upset that you cannot control your emotions Tom will go off the deep end if Jerry can't pay him the money he owes.
See also: deep, end, off

go off the deep end

  (informal)
to suddenly become very angry or upset and start shouting at someone One minute we were having a perfectly reasonable discussion and the next minute you just went off the deep end!
See also: deep, end, off

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, off

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, off
References in classic literature ?
Some shady trees leaned over it, and rushes and water-lilies grew at the deep end.
The keeper was thrown in at the deep end for his debut in Wednesday's 3-2 League Cup defeat by old club Hearts.
McNair, 19, has been thrown in at the deep end due to a defensive injury crisis at Old Trafford.
The exhibition, titled The Deep End, was a collaborative effort of a group of art and design students from Northumberland College and the fruits of their labour is now set to be screened at the Woodhorn Museum, Ashington.
She's flung in at the deep end when, with no training or equipment, she's sent on the trail of Joe (Jason O'Mara), an ex-cop wanted for murder - who also happens to be an old flame who broke her heart.
On November 17, 2011, students found the 14-year-old Wenatchee High School freshman's body at the bottom of the deep end of the school's pool, where he participated in an aquatic P.
But I kept returning to the deep end, mostly for the bruise-free swims.
Cambridge, MASS--State officials are about to put a serious obstacle in the path of skateboarders lured each off-season to the empty 12-foot deep end at the Francis J McCrehan Memorial Swimming Pool in Cambridge.
But that means going in the deep end and Becky is scared--a fear that many young readers will relate to.
He was thrown in at the deep end and this is a serious deep end.
Roll Deep became one of the figureheads of the nascent grime scene in 2005 when they released their debut album In At The Deep End as well as two singles, The Avenue which peaked at number eleven in July 2005, and Shake A Leg which peaked at number 24 later that year.
THE parents of a boy who was rescued from the deep end of a swimming pool following a seizure have hailed the "hero" teaching assistant who saved his life.
During the trial, the court was told Chad had wandered off into the deep end of a pool while his father's attention was on his four-year-old brother, JJ.
These features should always be looked at before sitting down as you could see yourself diving not only in the deep end but in the wrong pool all together.
How long he wandered off for we cannot be precise, it was a matter of minutes not seconds and it seems that he wandered off into the deep end of the pool," he said.