noun
a part of a body of water or a surface that is deepest and furthest away from the surface
verb
to reach the bottom of a body of water or a surface
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The diver carefully descended to touch bottom and collect samples from the ocean floor.
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I had to swim all the way to the deep end of the pool just to touch bottom.
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I can't believe how shallow this lake is - you can practically touch bottom everywhere.
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After weeks of struggling with the project, I finally feel like I am starting to touch bottom and make progress.