How does “to discharge” develop to mean “to do everything necessary to perform and complete a duty”? [closed]

What’s the logical derivation behind definition 3 of to discharge:

3. Do all that is required to perform (a duty) or fulfil (a responsibility):

How does the etymology (listed in that link and here) lead to the foregoing meaning?

Etymonline: early 14c., “to exempt, exonerate, release,” from Old French deschargier (12c., Modern French décharger) “to unload, discharge,” from Late Latin discarricare,
from dis- “do the opposite of” (see dis-) + carricare “load” (see charge (v.)).

Motivation is from p 89, How the Law Works, Gary Slapper. Owing to comments on some previous posts, please advise if this question ought to be migrated to ELU. If not, please delete this last sentence.

Answer

Well, since you can charge someone with a duty or a responsibility, it doesn’t seem strange that the person so charged would discharge themselves of it by fulfilling the duty, would it?

The idea behind charging someone with a responsibility does not seem so strange, as a responsibility can weigh on someone. A responsibility is often seen as a burden.

Attribution
Source : Link , Question Author : NNOX Apps , Answer Author : oerkelens

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