
Be somebody’s middle name
Personal Traits
Used to emphasize a characteristic that is very strong or prominent in someone.

Persistence is Tom's middle name; he always finishes what he starts.
Figurative Sense
It's not a literal middle name but a figurative way to highlight a trait.

If you ask me, 'adventurous' should be Lara's middle name.
Positive or Negative
The phrase can be used for both positive and negative qualities.

Messy is definitely his middle name, look at his room!
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