noun
the surface of the earth, specifically in a military context
preposition
a word that shows the relationship between a noun (boots) and another word in the sentence (on)
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The military decided to send more boots on the ground to assist with the humanitarian mission.
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We need to get some boots on the ground to help clean up this mess.
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Let's get our boots on the ground and get this job done!
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In order to truly understand the situation, we need to have boots on the ground to gather firsthand information.