That is the sound of someone diving off a diving board and into the deep end of a swimming pool . The deep end is where the water is the deepest . The water in the deep end is deep enough to dive in head-first . Diving into the deep water is fun and can make you feel very free . For a second or two , you fly through the air before going into the water below . If the water is deep enough , and the pool rules permit it , it is safe to jump into the deep end . Some people may jump in wildly or without control . So , it is not surprising that the phrase “off the deep end ” has other meanings – besides simply jumping into a swimming pool . We use it in several situations . If someone has gone off the deep end , they have gone a little crazy ! They have become angry or excited . When someone goes off the deep end , we can also say they have lost their mind ! Someone crashed into Tony's car . But don't tell him until after his birthday party . He loves that car and will go off the deep end when he hears the news . “Go off the deep end ” can also mean that you jump into a project without much preparation or thought . You do something on the spur of the moment – quickly and without thinking about the results . Did you hear the news about Jake ? He met a woman a month ago and they just got married ! Talk about jumping off the deep end . “Going off the deep end ” can mean you are acting in a very strange or extreme way . You seem irrational – like in this example . When my friends saw me laughing to myself , they thought I had dove right off the deep end . I told them that I had just won $10,000 . Then they understood my seemingly crazy behavior . When we go off the deep end , we experience something in the extreme . We often use this expression when talking about strong emotions : love , anger , fear , and sadness . I have never seen Aisha so in love . She's really fallen off the deep end over this new guy in her life . These are things we lose our minds over . We lose emotional control . Did you notice the different verbs we use with “off the deep end ”? You can dive , fall , jump , or go off the deep end . And sometimes life's troubles can push you off the deep end ! So , those are the different meanings of the expression “off the deep end ” and how we use them . I hope I didn't give you too many examples . That may push some listeners right off the deep end . But join us again next week !