noun. A board or ramp used as a removable footway between a ship and a pier.

noun. A board used as a temporary footbridge between a ship and a dockside

noun. a temporary bridge for getting on and off a vessel at dockside

"First down the gangplank was an Irish teenager named Annie Moore who subsequently became the poster child for the immigrant dream in a nation of immigrants."

gangway  

walk the gangplank  

footbridge  overcrossing  pedestrian bridge  

gangway  

Bifrost  access  adit  air lock  approach