lose it

verb7

1. •
   (informal) To be overcome with emotion.
2. •
   (informal) To become explosively angry; to lose one's temper.

   • When my dad found out I had failed the exams, he just lost it.
3. •
   (informal) To feel devastated, or distraught, especially when one's sadness is overwhelming.

   • When she heard the news about her cousin's death, she lost it.
4. •
   (informal) To begin to laugh uncontrollably.

   • When the teacher's chair broke, the class completely lost it.
5. •
   (informal) To lose one's mind, go crazy.
6. •
   To lose control of a situation.

   • Even then, she defended everything she had sought to achieve, saying she had “the right policies at the wrong time”. “That’s when I thought ‘she’s totally lost it’,” said a former aide. — 2023
7. •
   (informal) To cease to have a skill or ability, to lose one's touch, to be washed up.

   • When you think about all she's done for the sport, it's kind of sad, but she's completely lost it over the past few years.