
der Schwung
momentum
A fast, often arcing movement that arises from an impulse and carries a certain force or energy with it.
Er öffnete die Tür mit Schwung und trat ein.
He opened the door with momentum and stepped inside.
momentum / energy
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momentum
A fast, often arcing movement that arises from an impulse and carries a certain force or energy with it.
Er öffnete die Tür mit Schwung und trat ein.
He opened the door with momentum and stepped inside.

energy
Inner energy, enthusiasm, or drive that propels a person or an activity.
Nach dem Urlaub war sie wieder voller Schwung für die Arbeit.
After her vacation, she was full of energy for work again.

to get going
To begin to become active, lively, or productive.
Die Party brauchte eine Weile, um richtig in Schwung zu kommen.
The party took a while to really get going.

batch
Colloquial for a larger number or amount of things or people that arrive or are dealt with all at once.
Heute ist ein ganzer Schwung neuer Bewerbungen angekommen.
A whole batch of new applications arrived today.

sweep / flourish
An elegantly curved line or form, for example in handwriting or architecture.
Ihre Unterschrift hat einen schönen Schwung.
Her signature has a beautiful flourish.
The noun 'der Schwung' (momentum/energy) is closely related to the verb 'schwingen' (to swing). A swinging movement generates momentum, which helps you understand the basic meaning of energy and movement.
Die Turnerin holte auf der Schaukel Schwung für ihren Absprung.
The gymnast built up momentum on the swing for her jump.
To describe a movement, the phrase 'Schwung holen' (to build up momentum) is often used for the preparation, and 'mit Schwung' (with momentum) for the execution.
Der Golfer holt mit dem Schläger Schwung und schlägt den Ball.
The golfer builds up momentum with the club and hits the ball.
When talking about motivation, people often speak of having 'neuen Schwung' (new energy) or being 'voller Schwung' (full of energy). You can also 'mitnehmen' (carry forward) or 'verlieren' (lose) the momentum.
Nach dem erfolgreichen Projektstart wollen wir den Schwung mitnehmen.
After the successful project launch, we want to carry the momentum forward.
The phrase 'in Schwung kommen' (to get going) means that something slowly starts to function or become lively. With 'etwas in Schwung bringen' (to get something going), you can actively start this process.
Am Montagmorgen brauche ich immer einen Kaffee, um in Schwung zu kommen.
On Monday mornings, I always need a coffee to get going.
The meaning 'eine große Menge' (a large amount) is colloquial. It is often used in the form 'ein ganzer Schwung' (a whole batch) to talk about a group of things or people that arrive all at once.
Der Postbote hat heute einen ganzen Schwung Pakete für die Nachbarn gebracht.
The mail carrier brought a whole batch of packages for the neighbors today.
In this meaning, 'Schwung' (sweep/flourish) describes an elegant, curvy line. People often say that handwriting or a drawing 'einen schönen Schwung hat' (has a beautiful flourish).
Die Kalligrafin zog die Buchstaben mit elegantem Schwung.
The calligrapher formed the letters with an elegant flourish.
position / item / lot
Der Posten and der Schwung can both refer to a large quantity of goods. Der Posten presents the goods as a related unit, whereas der Schwung is colloquial and emphasizes that a lot arrives or is handled all at once. In a factual description of goods, Posten is usually more appropriate.

Heute ist ein neuer Schwung Kleidung für den Verkauf angekommen.
A new batch of clothing for sale arrived today.
Der Händler kaufte einen großen Posten Kleidung zu einem günstigen Preis.
The dealer bought a large lot of clothing at a good price.