
der Busen
breast
The female breast or a woman's breasts.
Das Kleid hatte einen tiefen Ausschnitt, der ihren Busen betonte.
The dress had a low neckline that emphasized her breasts.
breast / bosom / gulf
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breast
The female breast or a woman's breasts.
Das Kleid hatte einen tiefen Ausschnitt, der ihren Busen betonte.
The dress had a low neckline that emphasized her breasts.

bosom
In elevated or poetic language, a person's chest, male or female, as the symbolic seat of emotions.
Er spürte eine große Erleichterung in seinem Busen.
He felt great relief in his bosom.

in nature's bosom
An idiom meaning that one is in the midst of untouched nature, far from civilization.
Im Urlaub entspannten sie eine Woche lang am Busen der Natur.
On vacation, they relaxed for a week in nature's bosom.

gulf / bay
An outdated or geographical term for a bay or gulf in the sea. Today it is mostly used as part of compounds such as 'Meerbusen' (gulf).
Die Schiffe suchten im weiten Busen des Meeres Schutz vor dem Sturm.
The ships sought shelter from the storm in the wide gulf of the sea.
The expression 'am Busen der Natur' (in nature's bosom) is a fixed idiom. It is always used in this form and describes being in a quiet place in nature.
Wir verbrachten das Wochenende am Busen der Natur, weit weg von der Stadt.
We spent the weekend in nature's bosom, far away from the city.
The old geographical meaning 'Bucht' (bay) is now found almost only in compound words such as 'Meerbusen' (gulf). A 'Meerbusen' is a large bay or gulf.
Der Persische Golf ist ein bekannter Meerbusen.
The Persian Gulf is a well-known gulf.
'Busen' (breast) as a term for the female breast is often felt to be somewhat more formal, polite, or even medical than other colloquial words.
Bei der Untersuchung tastete die Ärztin den Busen ab.
During the examination, the doctor palpated the breast.
The use of 'Busen' (bosom) as the seat of emotions is typical of elevated, poetic language. In this case, the word can refer to both men and women.
Ein Gefühl der Freude erfüllte seinen Busen.
A feeling of joy filled his bosom.
chest / breast
Brust and Busen can refer to the female breast area. Brust is the usual, more matter-of-fact term and can also refer to a single breast; Busen usually refers to both breasts together and often sounds more euphemistic. In neutral statements, Brust is usually the better choice.

Das Kleid bedeckte ihren Busen vollständig.
The dress completely covered her breasts.
Nach der Untersuchung verspürte sie nur an der linken Brust noch leichte Schmerzen.
After the examination, she felt only mild pain in her left breast.