Final answer:
The word 'jarring' in the sentence means 'shrill'.
Step-by-step explanation:
The meaning of the underlined word 'jarring' in the sentence is shrill. The context clues in the sentence indicate that the trumpet produced a loud, unpleasant noise that caused everyone to quickly cover their ears. In this context, 'jarring' suggests a loud and dissonant sound, which aligns with the definition of 'shrill'.
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