Hacer un feo a alguien

[ROBINDESBOIS]

Usado en contextos como refutar una invitacion de comida, fiesta, boda etcc.
English?

[poli]

to tender back regrets

[ROBINDESBOIS]

Ej:
Voy a ir a la boda de su hija, por no hacerla un feo, pero deberia no ir, no se porta bien con su hermano.
CAn u translate this using the expression ? I isolation I don't grasp it.

[poli]

to snub

[JPablo]

Ej:
Voy a ir a la boda de su hija, por no hacerla un feo, pero deberia no ir, no se porta bien con su hermano.

Here is my try, (with 3 options!) :)

I am going [to go] to their daughter's wedding, just not to snub/slight her, [or not to be rude with her] but I shouldn't go, as she treats her brother badly.

[ROBINDESBOIS]

y que es eso de tender back regrets

[JPablo]

To tender = ofrecer, presentar
regrets = excusas
5. regrets, a polite, usually formal refusal of an invitation: I sent her my regrets.

As far as "back" is concerned, I am not totally sure, but I take Poli will illuminate us...
Something on the order of "echarse atrás"?
"Presentar mis excusas echándome atrás"?
"O lamentar tener que echarse atrás"?
Por ahí deben ir los tiros...

[poli]

Now that I think of it to tender regrets is better than to tender back regrets.(to send back /to sent)
When one receives a formal invitation with an RSVP, if you can't go, it
is polite tender your regrets.

[ROBINDESBOIS]

Ok, I see now. Thanks.