Origin of "Tread":
The word "tread" comes from the Old English word "trēdan," which means "to step, walk, trample." The word has been used in English for centuries and has a long and rich history.
Use in Idioms:
"Tread" is often used in idioms, such as:
* Tread water: To maintain a position without making progress.
* Tread lightly: To be careful and avoid causing offense.
* Tread on someone's toes: To offend or upset someone.
* Tread a fine line: To be in a difficult situation where one must be careful not to offend either side.
These idioms all use the verb "tread" in a metaphorical sense to describe actions or situations that involve careful movement or navigating delicate situations.
In Summary:
While "trod" itself isn't an idiom, it's the past tense and past participle of "tread," a verb with a long history and used in many common idioms.