cast, drop
The ship cast anchor in the bay. | We dropped anchor off a small island.

raise, weigh
We raised the anchor and set sail. | We weighed anchor next morning and sailed south.

lie at, ride at
The ship lay at anchor in the bay.

at ~
the ships at anchor in the harbour

firmly, securely
The crane is securely anchored at two points.

to
The ropes were anchored to the rocks.