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Phrase(s): Allow me. [and] Permit me.
Please let me help you. (Typically said by someone politely assisting another person, as by opening a door or providing some personal service. In Allow me, the stress is usually on me. In Permit me, the stress is usually on -mit.) • Tom and Jane approached the door. "Allow me," said Tom, grabbing the doorknob. • "Permit me," said Fred, pulling out a gold-plated lighter and lighting Jane’s cigarette.
McGrawhill's American Idioms And Phrasal Verbs