What does "below par" mean?

Not up to the average or normal standard.

What is a synonym for "below par"?

Common synonyms include: ailing, at a discount, at a reduction, bad, below, below deck.

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prep_phrase ·Rare ·Advanced level

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1
Not up to the average or normal standard. idiomatic
"Steve Gerrard, unusually, had a below-par night, too, even if it was a lovely delivery to set up Welbeck to make it 2-2 with a glancing header."
2
(of a score) Less than par for the hole or course (which in golf, means better than par).
3
Having a price below its face value.

"Steve Gerrard, unusually, had a below-par night, too, even if it was a lovely delivery to set up Welbeck to make it 2-2 with a glancing header."