"everyday terms" is correct and usable in written English.
It means common words or expressions used in everyday life. For example, "I want to explain this complicated concept in more everyday terms so everyone will understand."
In everyday terms, this box set is too much music.
(To put this in everyday terms: that's like buying a fancy safe, then taping the combination to the door).
[To] put it into everyday terms that is £300,000 for every man, women and child in Scotland".
We become relevant by explaining, in everyday terms, what God wants us to know and that is sometimes very different from the way we currently think.
In everyday terms, this says that no matter how hard you try, you will never be able to reduce all of mathematics to the application of fixed rules.
For ordinary listeners, Davis's appeal – intellect aside – was his fresh approach to the programme and ability to explain complicated issues in everyday terms.
It is believed that only one attacker was involved, but the Met the everyday term for the Metropolitan Police is taking nothing for granted, and is conducting a search of the whole area.
Stills once thrived in the Northeast, with rum in colonial Massachusetts, applejack that made Jersey Lightning an everyday term and Monongahela ryes from Pennsylvania and Delaware that were a staple before bourbon existed.
The state of some countries is so dire that the everyday term "developing country" does not fit current realities any more.
So, when Brown and others adopted it as a term of mental science, they were adopting an everyday term and giving it a new theoretical role.
On the question of whether "emotion" is a "folk" or "everyday" term rather than a scientific one, there is a clear historical story to tell.
