der Leib
body
An elevated or old-fashioned term for the body of a human or animal.
Er zitterte am ganzen Leib vor Kälte.
His whole body was trembling from the cold.

body
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body
An elevated or old-fashioned term for the body of a human or animal.
Er zitterte am ganzen Leib vor Kälte.
His whole body was trembling from the cold.

Although 'der Leib' (body) is rare as a standalone word, it is an important component of many compound nouns. Examples are 'der Leibwächter' (bodyguard) or 'die Leibspeise' (favorite food).
Der Präsident wird rund um die Uhr von Leibwächtern geschützt.
The president is protected by bodyguards around the clock.
'Der Leib' (body) is an old-fashioned or elevated term for the body. In normal usage, you always use 'der Körper' (the body) instead.
In alten Gedichten wird oft vom schwachen Leib und der starken Seele gesprochen.
In old poems, people often speak of the weak body and the strong soul.
The idiom 'mit Leib und Seele' means that one does something with complete passion and dedication. It is often used to describe professions or hobbies.
Er ist Musiker mit Leib und Seele.
He is a musician with heart and soul.
The expression 'jemandem zu Leibe rücken' means to confront or pressure a person forcefully. The person being confronted is always in the dative.
Die Journalisten rückten dem Minister mit unangenehmen Fragen zu Leibe.
The journalists went after the minister with unpleasant questions.
The expression 'sich jemanden/etwas vom Leibe halten' has a fixed structure: the reflexive pronoun is in the dative, while the person or thing being avoided is in the accusative.
Ich versuche, mir negative Menschen vom Leibe zu halten.
I try to keep negative people at bay.
body
'der Körper' and 'der Leib' can both mean the physical body of a person or animal. 'der Körper' is the normal, neutral word and fits in almost all everyday situations, at the doctor, in sports, or at school. 'der Leib' sounds elevated, old-fashioned, or literary. Today you mostly hear it in fixed expressions or in special kinds of texts. The words are easy to confuse because their meanings are close. In normal conversation, however, 'Körper' is almost always more natural.

In dem alten Gedicht wird der Leib des Helden als stark und müde zugleich beschrieben.
In the old poem, the hero's body is described as both strong and tired.
Karim achtet beim Training darauf, seinen Körper nicht zu überlasten.
During training, Karim makes sure not to overstrain his body.