what is over

Over
There are many meanings from dictionary.
I show some main meanings to you.

For perp.
1 高於
e.g. a light over table 燈於桌之上
2 橫越
e.g. jump over 跳過
3 覆蓋; 放在…上面
e.g. put rocks over a cave entrance 把岩石放在洞穴入口上方
4 超過 (數量)
e.g. over five hours 超過五小時

For adv.
1 在頂端地; 上方地
e.g. climbed the ladder and peered over 爬上梯子俯視
2 橫越
e.g. cross over 越過
3 結束
e.g. Game over. 結束了
There are many meanings about over in the following website. Please read it!

For perp.
1 高於
e.g. a light over table 燈於桌之上
2 橫越
e.g. jump over 跳過
3 覆蓋; 放在…上面
e.g. put rocks over a cave entrance 把岩石放在洞穴入口上方
4 超過 (數量)
e.g. over five hours 超過五小時

在…上方,在…上面;越過;多於…以上;在…期間;遍及

If it is a preposition it means 垮過,but if it's verb then it means過去。