좀
jom
It shrinks the request, not the amount
The picture You fold a request or a complaint small in your palm before holding it out. The actual size hasn't changed.
Where the picture shows up in 좀
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folding a request small
물 좀 주세요.
mul jom ju-se-yo
Could I have some water?
Not 'only a little water'. Without 좀 it lands like an order.
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folding a complaint small
이거 좀 비싸네요.
i-geo jom bi-ssa-ne-yo
That's a bit pricey.
Often it really means 'way too expensive'.
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lightening what you ask of someone's time
잠깐만 좀 기다려 주세요.
jam-kkan-man jom gi-da-ryeo ju-se-yo
Could you wait just a moment?
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playing down a call for help
저 좀 도와주세요.
jeo jom do-wa-ju-se-yo
Could you give me a hand?
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playing down your own condition
오늘 몸이 좀 안 좋아요.
o-neul mo-mi jom an jo-a-yo
I'm not feeling great today.
People say this when they feel awful too. Don't read 좀 as literally 'slightly'.