To go up a tree is to go to a high place. A lot of trees have branches that go up high into the air.
She went up the tree to get a better view.
The children were playing up in the tree, and the parents wanted to make sure they didn't get too close to the branches.
noun
the upper branches and leaves of a tree or other plant
Synonyms:
1
A treetop house provides accommodation for the adventurous.
2
The muddy waters reached roofs and treetops in New Braunfels.
3
Visitors walk through the area and can also view it from treetop lookouts.
4
He wants to climb to the treetop.
5
The mother found the boy at the treetop.
6
The child almost fell from the treetop.
7
The treetop layer is the rainforest's green ceiling.
8
Marsupials roamed the treetops of Australia's rain forests.
9
These are unmistakable birds, although often inconspicuous in the treetops.
10
New research suggests massive marsupials lived in treetops.