
sündigen
to sin
To commit a sin; to violate religious or moral commandments.
In seiner Predigt sprach der Pfarrer darüber, warum Menschen sündigen.
In his sermon, the pastor spoke about why people sin.
to sin
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to sin
To commit a sin; to violate religious or moral commandments.
In seiner Predigt sprach der Pfarrer darüber, warum Menschen sündigen.
In his sermon, the pastor spoke about why people sin.

to indulge
In a figurative sense, to treat oneself to something considered unhealthy or excessive, especially food. Often used in the context of a diet.
Heute sündige ich mal und bestelle mir ein großes Stück Schokoladenkuchen.
Today I'm going to indulge a little and order myself a big piece of chocolate cake.
The verb 'sündigen' (to sin) is derived directly from the noun 'die Sünde' (sin). When someone 'sündigt' (sins), they commit a sin.
Er beichtete seine Sünden, weil er gesündigt hatte.
He confessed his sins because he had sinned.
You can recognize the figurative meaning by the fact that it refers to small, everyday 'Vergehen' (offenses), usually in connection with enjoyment (eating, drinking, shopping). The tone is often humorous or ironic, while the religious meaning is very serious.
Bei diesem leckeren Eis muss man einfach sündigen!
With this delicious ice cream, you simply have to indulge!
In colloquial language, 'sündigen' (to indulge) is very often used in this figurative meaning. It often appears together with the word 'mal' to emphasize that it is an exception.
Normalerweise esse ich gesund, aber heute sündige ich mal mit einer Pizza.
Normally I eat healthily, but today I'm going to indulge a little with a pizza.
In the religious or moral meaning, 'sündigen' (to sin) is often used with the preposition 'gegen' and the accusative to express what someone is violating.
Er hatte das Gefühl, gegen ein wichtiges Gebot gesündigt zu haben.
He had the feeling that he had sinned against an important commandment.
to treat oneself / to not begrudge
When talking about food, gönnen and sündigen can both mean allowing yourself something special. Gönnen sounds neutral or positive and emphasizes enjoying it, while sündigen usually refers jokingly to something unhealthy or excessive, for example while on a diet. Gönnen is the better choice for a small pleasure you allow yourself deliberately.

Während meiner Diät sündige ich heute mit einem Stück Schokoladenkuchen.
While I'm on my diet, I'm indulging in a piece of chocolate cake today.
Nach der Wanderung gönne ich mir ein Stück Schokoladenkuchen.
After the hike, I treat myself to a piece of chocolate cake.