Final answer:
To be vulnerable to something means to be open to harm, danger, or damage without proper defense.
Step-by-step explanation:
To be vulnerable to something means to be susceptible or open to harm, damage, or danger. It implies a lack of protection or defense against a particular thing or situation. For example, someone who is vulnerable to a disease may be more likely to contract it due to a weakened immune system or lack of vaccination.
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