in God's/heaven's name Definition in British English Dictionary
Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

Definition of "in God's/heaven's name" - British English Dictionary

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 Learners Dictionary & Thesaurus © Cambridge University Press)