with all due respect

Prepositional phrase

formal idiomatic

(formal, idiomatic) A phrase used before disagreeing with someone or saying something they may find offensive, usually considered polite.

Japanese Meaning

相手に敬意を表しながら、率直な異論や反論を述べる前に使われる表現 / 相手を不快にさせないように、丁寧に意見の違いを述べる際の前置きの言い回し

with all due respect, I must disagree with your assessment of the project's priorities.

失礼を承知で申し上げますが、プロジェクトの優先順位に関するあなたの評価には同意できません。

Sense（1）

(formal, idiomatic) A phrase used before disagreeing with someone or saying something they may find offensive, usually considered polite.

With all due respect, Sir, I don't think that's the case.