IDIOM ►

a low bar

Meaning 1
Track sports: The bar set for hurdles, high jumps, or pole vaulting is set high and higher for the runners or jumpers as the meets progress and the competition gets more difficult.
Sentence 1
The record for pole vaulting was set at Donetsk by Renaud Lavillenie. The bar was at 6.16 meters.
Meaning 2
The lowest bar set is the least restrictive and the least difficult.
Sentence 2
"The Corwyn (gun) bill would set a national bar at the lowest denominator."

Derivation

Track sports.