
der Übertritt
switch
A person’s change from one group, party, religion, or organization to another.
Der Übertritt des Abgeordneten zur Oppositionspartei sorgte für Schlagzeilen.
The lawmaker’s switch to the opposition party made headlines.
switch / crossing
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switch
A person’s change from one group, party, religion, or organization to another.
Der Übertritt des Abgeordneten zur Oppositionspartei sorgte für Schlagzeilen.
The lawmaker’s switch to the opposition party made headlines.

line crossing
In sports, crossing a marking line, which is counted as an error or foul, for example in shot put, long jump, or bowling.
Wegen eines knappen Übertritts wurde der Wurf für ungültig erklärt.
Because of a very slight line crossing, the throw was declared invalid.

overflowing
A river or other body of water going over its banks, usually as a result of flooding.
Der starke Regen führte zum Übertritt des Flusses an mehreren Stellen.
The heavy rain led to the river overflowing at several points.
'Der Übertritt' is the noun form of the verb 'übertreten' (to cross over/violate). The basic idea of 'stepping over something' or 'crossing a boundary' appears in all meanings: you switch to another party, step over a line, or a river overflows its banks.
Sein Übertritt zu einer anderen Religion überraschte die ganze Familie.
His conversion to another religion surprised the whole family.
When someone changes to another group, the preposition 'zu' (+ dative) is used. People speak of 'Übertritt zu einer Partei' (switch to a party) or 'zum Christentum' (conversion to Christianity).
Der Übertritt des Spielers zum Konkurrenzverein wurde offiziell bestätigt.
The player’s switch to the rival club was officially confirmed.
The context makes the meaning clear: politics or religion points to a change of group. Sports terms like 'Wurf' (throw) or 'Sprung' (jump) indicate crossing a line. Words like 'Fluss' (river), 'Ufer' (bank), or 'Hochwasser' (flood) signal the nature-related meaning.
Der Weitsprung war ungültig wegen eines minimalen Übertritts.
The long jump was invalid because of a minimal line crossing.
transition / crossing
Übergang and Übertritt can both describe a change into a new area. Übergang is general and emphasizes the process, while Übertritt places greater emphasis on a person joining another group or organization and often sounds more formal. Choose Übertritt for a clear change in affiliation.

Sein Übertritt zu einer anderen Organisation wurde offiziell bekannt gegeben.
His move to another organization was officially announced.
Der Übergang von der alten zur neuen Organisation verlief langsam.
The transition from the old organization to the new one happened slowly.