Choose the sentence in which the usage of the word GROUND is incorrect or inappropriate.
To determine the incorrect or inappropriate usage of the word GROUND, let's analyze each sentence:
The phrase thin on ground should be thin on the ground, meaning scarce or in limited numbers. The absence of the makes the usage incorrect.
Here, held their ground means they maintained their position without retreating. The usage is correct and appropriate.
This sentence uses covered new ground to indicate discussing or dealing with new topics, which is correct and appropriate.
The phrase from the ground up means starting from the very beginning. The usage is correct and appropriate.
Therefore, the incorrect or inappropriate sentence is: