Collect (oneself) phrase
To regain your composure in order not to let your emotions or feelings influence your behavior or actions.
After collecting himself, John approached his unfaithful wife and told her to divorce.
If I hadn't collected myself, the fight would have come about.
When I stood in front of the camera for the first time, I was nervous. However, shortly after that, I collected myself.
The verb "collect" must be conjugated according to its tense.
The origin of this phrase is not clear.
Children or adults often say this phrase to get their friends to join in something, especially to jump into a swimming pool (pond, lake, etc.)
“Last one in is a rotten egg!” yelled Jane, jumping into the pool.