What is the meaning of Amidships?

In the middle of a ship, either longitudinally or laterally.

Usually in the line of the keel, but sometimes halfway between bow and stern; often contracted to “midships.” (FM 55-501).

On the flank, at a vulnerable place.

A helm order, normally shortened to midships!, to centre the helm in the line of the keel.

Source: wiktionary.org