noun
the upper side or part of something
adjective
located on or pertaining to the upper side or part of something
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The topside of the ship offers a great view of the ocean.
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Let's hang out on the topside of the boat for a better breeze.
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I love chilling on the topside of the yacht, it's so peaceful.
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She always tries to stay on the topside of things, never letting problems get her down.