Also means
to serve (a sentence)
Usage Note
purger covers technical senses (draining air from pipes or radiators — purger un radiateur) and legal/administrative ones — purger une peine means 'to serve a sentence'. Historically it referred to medical purging. The noun purge can mean a political purge as well as a technical drainage.
Examples
"Il faut purger les radiateurs avant l'hiver."
Natural Translation
The radiators must be drained before winter.
Literal Translation
It is necessary to purge the radiators before winter.
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