go underground

Meaning: To go into hiding or begin operating in secret.

Language: English

Literally: (Already vivid in English)

Example: “After the leak, the source went underground and stopped answering reporters.”

Category: Daily Life

Origin: "Underground" for secret activity is linked especially to the resistance movements of the Second World War, which were known as the underground. Earlier, it described the Underground Railroad that helped enslaved people escape in 19th-century America.

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