Chinese · Pronunciation Guide
ü-SAHN — but both syllables dip in citation form, so the first converts and you say yú sǎn.
yǔsǎn
A textbook conversion — two dipping tones in contact, so the first rises. What makes this one demanding is the vowel: yǔ already requires holding two unfamiliar positions at once, and now it also has to carry a tone that is not the one written. Practise the vowel first and the sandhi second.
Listen: 雨伞
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快下雨了,带上雨伞。
Kuài xià yǔ le, dài shàng yǔsǎn.
It's about to rain, take the umbrella.
Listen: 快下雨了,带上雨伞。
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快下雨了,带上雨伞。 contains the same character twice with different behaviour. In 下雨 the yǔ ends a clause and keeps its full dipping contour; in 雨伞 it is followed by another dipping tone and converts to a rise. Same syllable, two pronunciations, one sentence — as clear a demonstration of the rule as you could ask for.
Replacing ü with a plain "oo" is the standard error, giving "yoo-sahn". Keep the tongue forward while the lips round. Then there is the conversion, which learners skip — producing two laboured dips. And the s is sometimes retroflexed by analogy with sh, when it should be a thin hiss with the tongue tip right at the teeth.