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Path of least resistance

The path of least resistance is the physical or metaphorical pathway that provides the least resistance to forward motion by a given object or entity, among a set of alternative paths.
The concept is often used to describe why an object or entity takes a given path. The way in which water flows is often given as an example for the idea.

The thing, option, or course of action that is easiest to do; that which avoids confrontation, difficulty, awkwardness, or tension.

Dictionary

• https://idioms.thefreedictionary.com/path+of+least+resistance

Wiki

• https://wikipedia.org/wiki/Natural_lines_of_drift

• https://wikipedia.org/wiki/Path_of_least_resistance

• https://wikipedia.org/wiki/Principle_of_least_effort

• https://wikipedia.org/wiki/Stationary_Action_Principle