There are two ways of knowing the meaning of the word 'get' - grammar and context. Firstly, grammar. If 'get' is followed by a noun/direct object, it means obtain, receive, fetch. For example: I'm going to the kitchen to get a drink of water. Where did you get your new shoes? I got this as a present for my birthday. If it's followed by a place or prepositional phrase, it means arrive: When did you get home? He got to the top of the mountain. If it's followed by an adjective, it means 'become'. He got ill. They're getting angry. These are the main uses of 'get'. Probably 90% of the time, when we use 'get' it has one of the above three meanings. Secondly, context. If someone is telling a joke that you don't understand, and then suddenly you realise what is funny and you start to laugh, you can say 'I get it!'. It's clear from the context that what you suddenly 'get' is the meaning of the joke i.e. that you understand it. How about 'I'll get you'? Again, the context will tell you. If you are making an arrangement with your friend, and you offer to pick up your friend at his/her house at a certain time, you'd say 'I come and get you at seven'. This is the first meaning above (take/fetch). 'Get' doesn't really mean kill or hurt. But, if you are watching a gangster movie, and you hear a bad guy say to his enemy, in a threatening voice, 'I'm going to get you', you understand from the context that this is something rather less friendly. It's the same in all languages, isn't it? A neutral comment can have a different meaning, or you can infer a different meaning, depending on the context. Remember of course that 'get' can combine with other words to create new meanings, such as 'get over', but that's another story. I hope that helps to sort things out a bit for you.