by thunder

Old-fashioned surprise expression

By thunder is a mild oath expressing surprise, emphasis, or determination.

It belongs to a family of euphemistic exclamations that invoke weather or nature instead of God: By thunder, I think you're right!

The phrase sounds old-fashioned and theatrical, more likely encountered in period fiction than modern speech.

Related

bolt · good grief · land sakes · I declare · well I never · boom · mercy me · crikey · great Scott · good heavens · blimey · gadzooks · zounds · upon my word · oh my · crack · storm · holy cow

Opposites
intensity of expression

by thundersilence

Total lack of sound

meh · whatever · I suppose · if you say so · shrug

profanity level

by thundergoddamn

Profane intensifier expressing frustration

by God · damn it · hell · Jesus Christ · for God's sake

emotional register

by thunderoh well

Expression of mild resignation

never mind · it doesn't matter · who cares · so be it · c'est la vie

Family

by, thunder, thunders, thundered, thundering, thunderous, thunderously, thunderbolt, thunderclap

Familiarity
Top 500,000
Profile
Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G