
der Austritt
withdrawal
Leaving an organization, club, party, or religious community.
Er hat seinen Austritt aus dem Sportverein schriftlich erklärt.
He declared his withdrawal from the sports club in writing.
withdrawal / leak / balcony
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withdrawal
Leaving an organization, club, party, or religious community.
Er hat seinen Austritt aus dem Sportverein schriftlich erklärt.
He declared his withdrawal from the sports club in writing.

leak
The uncontrolled escape of a liquid or gas from a container or pipe.
Der Austritt von giftigem Gas führte zu einer Evakuierung.
The leak of toxic gas led to an evacuation.

small balcony
A structural feature that makes it possible to step outside, e.g. a small balcony.
Das Schlafzimmer hat einen kleinen Austritt mit Blick auf den Garten.
The bedroom has a small balcony with a view of the garden.
'Der Austritt' (withdrawal/leak/small balcony) is the noun related to the separable verb 'austreten' (to step out, to leave). The basic idea of 'stepping outside' connects all meanings: 'stepping out' of an organization, 'coming out' of a container (leaking), or stepping out onto a balcony.
Wegen des hohen Beitrags will er aus dem Verein austreten.
Because of the high membership fee, he wants to leave the club.
The preposition helps distinguish the meanings. 'Der Austritt aus' + dative describes leaving an organization. 'Der Austritt von' + dative describes the escape of a substance.
Sein Austritt aus der Partei sorgte für Aufsehen.
His withdrawal from the party caused a stir.
When leaving an organization, people often speak of 'seinen Austritt erklären' (to declare one's withdrawal), 'einreichen' (to submit), or 'bekannt geben' (to announce). Common contexts are 'der Austritt aus der Kirche' (leaving the church) or 'aus einer Partei' (from a party).
Sie hat ihren Austritt aus dem Vorstand offiziell erklärt.
She officially declared her withdrawal from the board.
When substances escape, typical combinations are 'der Austritt von Gas/Öl/Wasser' (the leak of gas/oil/water) or 'ein unkontrollierter Austritt' (an uncontrolled leak). The goal is often to 'einen Austritt verhindern' (prevent a leak) or 'zu stoppen' (stop it).
Die Feuerwehr konnte den Austritt der Chemikalien schnell stoppen.
The fire department was able to stop the chemical leak quickly.
resignation / withdrawal
Der Rücktritt means that someone gives up an office or function but can remain a member of the organization. Der Austritt, by contrast, ends the membership itself. A party leader can therefore resign without leaving the party.

Nach seinem Austritt ist Paul kein Mitglied der Partei mehr.
After leaving the party, Paul is no longer a member.
Nach seinem Rücktritt als Vorsitzender bleibt Paul Mitglied der Partei.
After resigning as chair, Paul remains a member of the party.