I am confused about the pronunciation of "harass". Dictionaries list it as
Is it about BrE and AmE difference? Which one is more prevalent?
Yes, both pronunciations are used.
Forvo currently lists six examples. From the United States, one speaker puts the accent on the first syllable, while two put the accent on the second syllable. From the U.K., two speakers stress the second syllable, although one speaker from Ireland stresses the first.
Final score in that small sample size: 3-3.
I've heard both, although in the U.S., I usually hear the accent put on the second syllable. Still, it's just one of those words that can be pronounced either way.
Actually I don't think there's any pronunciation for harass as in your first one.
But the second one is British English and the third is used in both British and American English as per Oxford Dictionary.
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