Farsi · Pronunciation Guide
Say "kuh-SEE," with the stress and a longer, clearer vowel on the second syllable.
kasi
Like چیزی, the stress lands on the final -ی ("-si"), the indefinite suffix, not on the first syllable.
Listen: کسی
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کسی در میزند.
Kasi dar mizanad.
Someone is knocking at the door.
Listen: کسی در میزند.
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In کسی در میزند, کسی is the subject meaning "someone," and در میزند is a compound verb literally "hits the door," idiomatically meaning "is knocking." This is a good example of a Persian compound verb (نور + فعل construction) where the everyday meaning — knocking — isn't obvious from a literal word-by-word translation, so it's worth memorizing در زدن as a unit meaning "to knock."
English speakers sometimes stress the first syllable, saying "KA-si" like the start of the English name "Cassie," but Persian stresses the second syllable. It also helps to remember کسی is grammatically like a pronoun (used as subject or object) while کس alone is rarely used by itself in everyday speech.