いちど一度ichidoにni
1.
A situation in which multiple events or actions occur simultaneously, or when a single task is accomplished in one instance, rather than incrementally.
2.
The occurrence of several distinct items or actions happening together as a unified event or in a single effort.
3.
The simultaneous execution of various actions or the gathering of multiple things in a single moment.
Example:
一度にひとつのことをするようにしなさい。