
schummeln
to cheat
To break the rules in a game, test, or competition in order to gain an unfair advantage.
Mein kleiner Bruder versucht immer, beim Kartenspielen zu schummeln.
My little brother always tries to cheat when playing cards.
to cheat
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to cheat
To break the rules in a game, test, or competition in order to gain an unfair advantage.
Mein kleiner Bruder versucht immer, beim Kartenspielen zu schummeln.
My little brother always tries to cheat when playing cards.

to fudge
To tell small untruths or slightly exaggerate or understate information (e.g., age, weight) in order to create a better impression.
Er hat bei seiner Größe ein paar Zentimeter geschummelt, um größer zu wirken.
He fudged his height by a few centimeters to seem taller.
If you want to say in which situation someone cheats or fudges something, use the preposition “bei” with the dative. This applies to both meanings of the word.
Er wurde erwischt, als er bei der Prüfung geschummelt hat.
He was caught cheating on the exam.
“Schummeln” (to cheat/fudge) is usually used for smaller, not very serious rule violations in everyday life. It often sounds more harmless and childlike than the word “betrügen” (to deceive/cheat).
Komm schon, beim Monopoly darf man doch mal ein bisschen schummeln!
Come on, you're allowed to cheat a little at Monopoly!
The context makes clear which meaning is intended. Words like “Spiel” (game), “Test” (test), or “Karten” (cards) point to unfair advantages. Words like “Alter” (age), “Größe” (height), or “Gewicht” (weight) point to small untruths about oneself.
Niemand mag es, wenn Mitspieler beim Kartenspiel schummeln.
Nobody likes it when other players cheat at card games.
to cheat / deceive
Here, betrügen and schummeln refer to gaining an unfair advantage by breaking rules. Betrügen usually sounds more serious, while schummeln is colloquial and often used for minor violations. The difference lies more in evaluation and register than in a clear-cut boundary.

Bei der Prüfung schummelte er, indem er kurz auf den Zettel seines Nachbarn sah.
He cheated on the exam by briefly looking at his neighbor's paper.
Bei der Prüfung betrog er systematisch mit gestohlenen Lösungen.
He cheated systematically on the exam using stolen answer keys.