A term of solace used mainly in Jamaica (not sure about the rest of the Caribbean), meaning - never mind or don't worry. Most people who are not from Jamaica often misinterpret this to mean - 'shut up', instead of something comforting, which it's really meant to be :)
Bob: "Ouch, I hit my toe on the door"
Moeisha: "Hush, it soon get betta"
Bob: "Why are you telling me to shut up, it really hurts!"
Moeisha: "Ah never sey fi shut up, mi did sey hush!"