This is the 1329th most frequent Swedish word.
abb
"Abb" is the Swedish word for perch, a type of freshwater fish.
Here, 'abb' is engaged metaphorically or colloquially, potentially referring to an ambiguous or undefined shape that resembles a fish.
Barnet såg på teckningen och undrade om det var ett abb.
The child looked at the drawing and wondered if it was an abb.
Here, 'abb' is used as a noun referring to the fish perch in Swedish.
Jag har aldrig fiskat en abb.
I have never caught a perch.
In this sentence, 'abb' refers to a critical or central aspect of a report, used informally.