spoiling the party
The phrase 'aguar la fiesta' in Spanish generally refers to the English equivalent of 'to spoil the party' or 'to rain on someone's parade'. The phrase is used when someone or something interrupts or ruins a previously enjoyable or special event, bringing about disappointment or dismay.
I don't want to ruin anyone's party.
This phrase expresses a desire not to negatively impact the enjoyment or celebration of others.
Bad weather can ruin the party.
Here, the phrase indicates that unfavorable weather conditions can spoil a planned celebration or event.
Don't let problems ruin the party.
This example encourages someone not to allow difficulties to diminish the joy of a gathering.