Chinese · Pronunciation Guide
mun, climbing from mid to high. Ordinary m, a short central vowel, and a front n.
mén
The upward contour is stable in all environments. Its useful contrast is with 们 men, the plural suffix, which has the identical segments and no tone at all — so the same syllable is a full second tone in one role and completely weightless in another, and only the grammar tells you which.
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请关门。
Qǐng guān mén.
Close the door, please.
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请关门。 keeps qǐng at a full dip because guān is level. Then guān holds high and mén climbs from there. As with all second tones after a first, the climb is compressed and native speakers dip slightly before ascending — so the sentence goes low, high, and then up again from just below that height.
The nasal drifts back to méng, which is a different syllable, and English ears do not flag it. Finish with the tongue tip on the ridge. The rise is the other issue: because the word often ends a short imperative, learners let the pitch fall as English does, and a falling mèn is a different word meaning stuffy or bored.