Nautical:
* The ship's keel was laid in 1890, marking the beginning of its construction.
* The storm damaged the ship's keel, leaving it vulnerable to sinking.
* The ship listed to one side, revealing the keel beneath the waterline.
Figurative:
* Her spirit was keeled over by the news of her friend's passing.
* The company's financial plans were keeled over by the unexpected economic downturn.
* The team's morale keeled over after a series of losses.
Other:
* The boat builder used a heavy timber to form the keel of the new sailboat.
* The keel of the ship was strong enough to withstand the harsh seas.
The meaning of "keel" will depend on the context of the sentence.