boat, ship
舟 centers on a small watercraft: a boat or ship, typically used for transport across water.
舟 is a pictograph of a small boat, with the modern form retaining a stylized hull and deck shape.
The shape of 舟 looks like a small boat with a flat bottom and raised ends, ready to carry people across the water.
For シュウ, imagine a boat named 'Shoe' that ferries people across a river: Shoe -> シュウ, and the boat is shaped like a floating shoe.
ark (i.e. Noah's)
small boat
pontoon bridge
lifeboat
navicular; boat-shaped
transportation by water (e.g. by ship)
cuttlebone
Noah's ark (Arca noae)
Noah's ark
landing craft
any port will do in a storm; when you've lost your boat midstream, even a pot is worth a fortune
dugout canoe
dugout canoe
not getting with the times; being unaware of how things are changing
to not be getting with the times; to be unaware that things are changing; to drop one's sword (in the river) and carve (a mark) on the boat (to mark the spot where the sword was dropped)
shipmates; fellow passengers
bitter enemies in the same boat; rivals finding themselves together by chance; strange bedfellows
swallowing a boat whole
fish large enough to swallow a whole boat; colossal fish
Fuegian steamer duck (Tachyeres pteneres); Magellanic flightless steamer duck