Both Uses

transgress
in
The Epic of Gilgamesh
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Lay upon the sinner his sin, Lay upon the transgressor his transgression, Punish him a little when he breaks loose, Do not drive him too hard or he perishes; Would that a lion had ravaged mankind Rather than the flood, Would that a wolf had ravaged mankind Rather than the flood, Would that famine had wasted the world Rather than the flood, Would that pestilence had wasted mankind Rather than the flood.†
Book 5

transgressor = someone who violates a rule, promise, or social norm
Lay upon the sinner his sin, Lay upon the transgressor his transgression, Punish him a little when he breaks loose, Do not drive him too hard or he perishes; Would that a lion had ravaged mankind Rather than the flood, Would that a wolf had ravaged mankind Rather than the flood, Would that famine had wasted the world Rather than the flood, Would that pestilence had wasted mankind Rather than the flood.†
Book 5 *

transgression = an act that violates a rule, promise, or social norm

Definitions:

(1) (transgress)
to violate a rule, promise, or social norm
(2) (meaning too rare to warrant focus)
Much more rarely (and archaically), transgress can mean: "spread over land, especially along a subsiding shoreline" as in "The sea transgresses along the West coast of the island."