Definition of “in God's/heaven's name” - English Dictionary

british dictionary

“in God's/heaven's name” in British English

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in God's/heaven's name

also in the name of God/heaven

used to add force to something that is said. Some people find the use of "God" offensive:

What in God's name caused that outburst?
Why in the name of God didn't you tell me sooner?

(Definition of “in God's/heaven's name” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)