Run aground

[Oralee]

When you [motor boat] [a flat] [chested] girl.

[DennisSt]

hit or reach the ground

[Dianne]

bring to the ground

[Tanya Shivari]

For a vessel to be immobilized by water too shallow to allow it to float.

[Thomassew]

Run aground refers to when a ship or submarine hits the sea bottom or land under the water, causing it to become stuck and unable to move. This can occur if the vessel strays out of a deep water channel or due to low tide, navigational errors or mechanical failure.