the cognitive condition of someone who understands
"he has virtually no understanding of social cause and effect"
Shrewdness.
"Her savvy business moves allowed her to turn a small investment into a massive fortune."
get the meaning of something
"Do you comprehend the meaning of this letter?"
To understand.
"She quickly realized that her lack of computer savvy would make it difficult to complete the project."
Shrewd, well-informed and perceptive.
"The savvy investor spotted the market trend before anyone else could act on it."
In plain English: Having savvy means being smart and knowing exactly what to do in any situation.
"The savvy shopper waited until the sale to buy her new shoes."
The word savvy comes from Portuguese saber and Latin sapere, which originally meant "to taste" before evolving to mean "to know." It entered English around 1785 as a term for practical intelligence or understanding, later becoming an adjective in the early 20th century.