An anchor is a heavy hooked object that is dropped from a boat into the water at the end of a chain in order to make the boat stay in one place.
When a boat anchors or when you anchor it, its anchor is dropped into the water in order to make it stay in one place.
If you anchor an object somewhere, you fix it to something to prevent it moving from that place.
If one thing is the anchor for something else, it makes that thing stable and secure.
If something is anchored in something or to something, it has strong links with it.
The person who anchors a television or radio programme, especially a news programme, is the person who presents it and acts as a link between interviews and reports which come from other places or studios.
The anchor on a television or radio programme, especially a news programme, is the person who presents it.
If a boat is at anchor, it is floating in a particular place and is prevented from moving by its anchor.
When the people on a boat drop anchor or cast anchor, they drop the boat's anchor into the water in order to prevent the boat from moving.
When the people on a boat weigh anchor or up anchor, they pull the anchor of the boat out of the water so that they can sail away.