Definition of ほんまつてんとう
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(n, vs, adj-no) failing to properly evaluate the (relative) importance (of); putting the cart before the horse; mistaking the cause for the end; mistaking the insignificant for the essential; getting one's priorities backwards
あなたの言っていることは本末転倒だと思わないかい?
Don't you think you're putting the cart before the horse?