Something that is thick has a large distance between its two opposite sides.

You can use thick to talk or ask about how wide or deep something is.

If something that consists of several things is thick, it has a large number of them very close together.

If something is thick with another thing, the first thing is full of or covered with the second.

Thick clothes are made from heavy cloth, so that they will keep you warm in cold weather.

Thick smoke, fog, or cloud is difficult to see through.

Thick liquids are fairly stiff and solid and do not flow easily.

If someone's voice is thick, they are not speaking clearly, for example because they are ill, upset, or drunk.

A thick accent is very obvious and easy to identify.

If you describe someone as thick, you think they are stupid.

If things happen thick and fast, they happen very quickly and in large numbers.

If you are in the thick of an activity or situation, you are very involved in it.

If you do something through thick and thin, you do it although the conditions or circumstances are very bad.