ˌport of ˈcall noun (plural ports of call) [countable usually singular]

1. informal one of a series of places that you visit:
My first port of call will be the post office.

2. a port where a ship stops on a journey from one place to another

[TahlilGaran] Dictionary of Contemporary English ▲

port of call
a place where you stop for a short time, especially on a journey.
Our first port of call was the delightful town of Bruges.

[TahlilGaran] English Idioms Dictionary ▲

port of call
n. phr.
1. Any of the ports that a ship visits after the start of a voyage and before the end; a port where passengers or cargo may be taken on or put off; an in-between port.
Savannah is a port of call for many Atlantic coasting vessels.
2. A place you visit regularly or often; a stop included on your usual way of going.
It was an obscure little restaurant which I had made something of a port of call.
His home had become one of my regular ports of call in Boston.

[TahlilGaran] English Idioms Dictionary ▲