"swing by" and "swing away"
What does it mean "swing by" and "swing away" I undertood by swing by, like stop by, If I am right, can you give me some synonymous of the word "stop by" (I think is pass by, come by, but I'm not sure) on the other hand, Swing by means "Go away", right?

Question

"swing by" and "swing away" 
What does it mean "swing by" and "swing away" I undertood by swing by, like stop by, If I am right, can you give me some synonymous of the word "stop by" (I think is pass by, come by, but I'm not sure) on the other hand, Swing by means "Go away", right?

Answer

Another way to say swing by/ stop by/ pass by/etc. is to say "Drop in"  or "Drop by". It's pretty slang-ish, but it isn't uncommon to hear a person say, "We'll drop by at about 7 o'clock." Meaning basically, to show up, usually for a short amount of time. 

Oh, and "swing away" is usually not said, unless a person is holding a baseball bat. ^_^

Answer

Swing by would be used when visiting someone, swing away is similar to a phrase such as "take your best shot".

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I never heard "Swing away" before, but when I saw "Scary Movie 3", Dennise Richards said to Charlie Sheen something like "Please, swing away" and I right away, came up with the idea of "go away". But a prefer a zillon times to ask, before using it, because I don't want to screw up.

Answer

"Swing by" and "stop by" are similar.  "Swing by" is just slang for "I'll be coming by".

ex. "I'll swing by your place", is similar to saying "I'll be stopping by your place."