This is the 4252nd most frequent Swedish word.
skärper
"Skärper" means "sharpens" or "enhances" in English.
In this sentence, 'skärper' is used to describe improving or focusing one's concentration.
Hon skärper sin koncentration innan provet.
She sharpens her concentration before the test.
Here, 'skärper' indicates making the rules stricter or more precise.
De skärper reglerna för att göra spelet rättvisare.
They are tightening the rules to make the game fairer.
In this usage, 'skärper' refers to enhancing or intensifying attention or focus.