If a soccer team scores 4 goals while its opponent scores only 1 in a match, how can we describe this kind of victory? What idioms and/or soccer jargon are there?
Resounding victory is fine.
Others could be 'decisive' victory for the winners, or 'embarrassing' loss for the losers.
Had it been 4-0 rather than 4-1, then it would be termed a 'whitewash'.
I don't know much about soccer, but I know that the scores are typically low (1-0, 2-1, etc). If in the world of soccer, 4 is considered a large score, then you could possibly call this a blowout: