sliding scale

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sliding scale

a variable scale according to which specified wages, tariffs, prices, etc., fluctuate in response to changes in some other factor, standard, or conditions

sliding scale

[′slīd·iŋ ′skāl]
(meteorology)
A set of combinations of ceilings and visibilities which constitute the operational weather limits at an airport; as the observed value of one element increases, the limiting value of the other element decreases, and vice versa.