Words that start with O

You go out when you go away from something, or out from inside something. For example, you might go out to a restaurant. If you rearrange some items, they become out of order.
The cat in the picture is getting out of a box.
The opposite of out is in.

An outline is a type of drawing where thin lines are used to define the edges of what you are drawing a picture of. Artists often start a picture by drawing the outline in lead pencil, and then coloring or shading it in.
An outline is also the way of describing an event or situation by giving only the most essential details, as in "here's an outline for Monday's telecast".

Outstretch means to spread out or expand some part of your body. The man in the picture has outstretched arms.

The ovary is an organ in the female reproductive system. Ovaries make eggs, which are needed for pregnancy. They also make hormones such as estrogen and progesterone.

Over is when you move above something. The soldiers in the photo are climbing over a wall.

The sky is overcast if it is almost entirely covered in clouds.
On an overcast day, there is often a high chance of rain.

Something is overgrown if it is covered in growth, outside of where it should be. Gardens can become overgrown if they are neglected and left to run wild with no-one to prune the plants and pull out the weeds.

Something is overloaded if it is carrying a load that is too big for it. The car in the picture is overloaded.

Oversleep means to sleep longer than you planned or needed, and you don't wake up at the usual time.

If you miss your alarm or fall back asleep, you might be late for something.

Owls are birds of prey, which means they eat other animals. They usually sleep during the day and hunt at night. Owls mostly hunt small animals, insects and other birds. They are found in almost everywhere on Earth.
A group of owls is called a parliament.