What is the meaning of the idiom " To eat away"?

Corrode

The correct answer is Option 2: Corrode.

The idiom “to eat away” means to gradually destroy or damage something, especially by corrosion or erosion. It is commonly used to describe a slow, continuous process of damage, like rust eating away metal or worry eating away a person’s peace of mind.

The other options are:

• Finish : The idiom for this is "to complete something."
• Eating up : This is a more literal meaning of the idiom, and it means to consume something completely.
• Destroy : This is a more extreme meaning of the idiom, and it means to completely ruin or demolish something. While “destroy” is a broader word, it does not capture this idea of gradual erosion. It can refer to sudden or immediate damage (like a bomb blast), which is not the core meaning of the idiom.