Collapses, with "over"

KEELS

Think of what a ship might do when it tips dramatically sideways.

The word "keels" means to fall or collapse, like a ship tipping over. The clue adds "with 'over'" to hint at the phrase "keels over," a common expression for something toppling or fainting. So, the answer is "KEELS," dropping the "over" since it’s already implied by the clue’s wording.