freighters hull flexing?

[Alex]

Sagging when the bow and stern are higher than the midsection, hogging when the midsection is higher than the bow and stern,

[Luke Archer]

I beliveve the term you are looking for is hogging. The sprinklers on deck are used to help keep the steel cooler to help compensate for the expansion of the boat in hot sun.

[Mike B]

it's called Hogging, looks like a hump back hog

[wond]

What do they call it when a ships deck/hull flexes from hot days. I have seen them run sprinklers on top of the hatches. Do they typically bend up in the middle or do they sag down. I think there is term to discribe this event.