Definition & Meaning of "by gosh"in English

What is the origin of the exclamation "by gosh" and how is it used?

By gosh is an exclamation used to express emphasis, surprise, or admiration. It appeared in English in the late 18th to early 19th century as a mild euphemism for "by God," letting speakers convey strong feeling without offending religious sensibilities. People used it in everyday speech, literature, and oral storytelling to react to astonishment, approval, or excitement. Today it is inoffensive, slightly old-fashioned, and folksy, often adding emphasis or a colorful tone to expressions of surprise or admiration.