layman's terms
To put something in layman's terms is to describe a complex or technical issue using words and terms that the average individual (someone without professional training in the subject area) can understand, so that they may comprehend the issue to some degree.
Example:
Instead of saying:
"You need a new piston, valve guides, stator, and counter-shaft balancer"
In layman's terms you'd say:
"There are some internal parts that need replaced"
Instead of saying:
"You need a new piston, valve guides, stator, and counter-shaft balancer"
In layman's terms you'd say:
"There are some internal parts that need replaced"