Common mistakes by native language
Japanese speakers
Mistake: Pronouncing "one" with a fully articulated alveolar nasal [n] at the end and adding a small pause before "more", so the two words stay clearly separate.
Why: Japanese has a moraic nasal (ん) that is pronounced with variable place depending on context in careful speech, but this variability is rarely applied consciously when speaking English, so learners default to a fixed, unassimilated alveolar [n] regardless of what follows.
Fix: Let the final [n] in "one" shift forward to become a bilabial [m] before the [m] of "more": the phrase becomes [ˈwʌmˈmɑr], almost sounding like "wum-more". Close your lips for both nasal sounds together rather than using the tongue tip.
Korean speakers
Mistake: Keeping the final nasal of "one" as a clear alveolar [n] rather than shifting its place to match the bilabial [m] that begins "more", producing two separate nasal releases.
Why: Korean syllable-final ㄴ maintains a consistent alveolar place in isolation and is not automatically assimilated toward the place of a following English word, so the L1 pattern of keeping ㄴ stable transfers directly into careful, unassimilated English speech.
Fix: Merge the two nasal sounds by closing the lips early: [ˈwʌmˈmɑr]. The nasal quality continues through both syllables without a break, and the tongue tip never touches the ridge — only the lips are active.
Chinese speakers
Mistake: Producing "one" with a distinct final [n] and starting "more" as an unrelated, separately-articulated syllable, without shifting the nasal's place of articulation.
Why: Mandarin final nasals (like the -n in words such as 三 sān) maintain their own place regardless of the following sound in a different word, so cross-word place assimilation is not a pattern Mandarin speakers apply by default in their own language.
Fix: Shift the nasal closure to the lips as soon as you finish the vowel of "one": [ˈwʌmˈmɑr]. Practice repeating "one more, one more" slowly, feeling the lips close early each time instead of the tongue tip.
Notes
"One more" is an extremely common request phrase, and its natural pronunciation depends on nasal place assimilation, where the final [n] of "one" shifts forward to become [m] under the influence of the following bilabial [m] in "more". Rather than two separate nasal releases, the phrase merges into a single continuous nasal sound stream: [ˈwʌmˈmɑr]. This mirrors what happens with word-final [n] before other bilabial consonants like [b] or [p], and understanding it builds transferable skill for phrases such as "ten boys". Learners who preserve the full alveolar [n] will not be misunderstood, but their speech will carry a subtle rhythmic stiffness. Because "one more" appears constantly in requests and casual conversation, mastering its natural pronunciation has high-frequency practical value.