A swing is a piece of playground equipment made out of a seat hanging from some kind of support. In playgrounds the support is made from metal or wood especially for the swing, and in backyards swings are often hung from a tree.
You use a swing by sitting in the seat and swinging it backwards and forwards. You can do it by yourself or you can get someone else to push you.
Something or someone is Swiss if it relates to or is from Switzerland.
A sword is a weapon that was used by knights many hundreds of years ago. Swords are usually around 2-3 feet long, made of steel, and have a straight or slightly curved blade that is sharp on both edges. The part of the sword you hold is called the hilt. Most swords have a casing that they could be stored in so the owner wouldn't hurt themselves, this is called a scabbard or a sheath.
Swung is the past tense of swing, for example "the door swung shut".
A symbol is a kind of picture that means something. Symbols are often used on signs, where they can express a lot of information that you can understand quicker and easier than writing.
Symmetry means that if you draw a line through something, usually down the middle, then the two halves of it are identical but reversed - like looking into a mirror. Things that are symmetrical are usually nice to look at.
People's faces are symmetrical because if you draw a line down the middle of your face the left and right sides are the same. In fact, your entire body is symmetrical, as are animal's faces and bodies. Lots of everyday things are symmetrical. How many symmetrical things can you see around you?
The picture is a shape that is symmetrical along the left and right half and the top and bottom halves.
The opposite of symmetry is asymmetry.