It’s about time. We are now on Instagram!
To become very distraught; lose control of oneself; suffer a kind of breakdown; crack up: told me to keep an eye on Dennis, that he looked like he was losing it/ of being totally stressed out, of ''losing it''/ Thieu was really tough, but that day he lost it. His spirit was broken
[1990s+; probably fr the notion of losing one's grip on reality]