The cat jumped on the windowsill and looked out.
Meaning: The cat quickly moved to the ledge at the bottom of the window and used its eyes to see something outside.
Choice of Words: Jumped means to quickly move into the air and then down. Windowsill is the ledge at the bottom of a window. Looked means to use your eyes to see something. When you put them together, it means the cat moved quickly onto the ledge at the bottom of the window and used its eyes to see something.
Alternative Expressions
Related Expressions