تعريف ومعنى "thick on the ground"

What is the origin of the idiom "thick on the ground" and when to use it?

The idiom "thick on the ground" likely originated from observations of situations where something is so plentiful or numerous that it appears to be densely or abundantly distributed across a surface, similar to objects or people being close together on the ground. This expression is used to describe a situation where something is present in large quantities, readily available, or easily found.