Final answer:
The word 'disembark' means to go ashore from a boat.
Step-by-step explanation:
The word 'disembark' means to go ashore based on the given context clues. When a person 'disembarks' from a boat, it means they are leaving the boat and stepping onto land. In this case, the guide will greet the person as they step off the boat to begin their city tour.
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