Spanish phrase
En nombre de ~, gracias.
Meaning
I would like to thank you on behalf of ___.
When to use it
Politely expresses thanks for a group. Suits speeches or announcements and sounds slightly more formal and gracious than a simple thank you.
Example dialogue
En nombre de la familia, gracias.
I would like to thank you on behalf of the family.
Gracias a ustedes.
Thank you; same to you.