too many cooks spoil the broth
If too many people participate in a task, especially in a leading role, the task will not be done very well.
She professes to keep her own counsel; she says, and truly enough, that “Too many cooks spoil the broth.”
ADV
completely, quite
The rainy weather quite spoiled our plans for a picnic at the beach.
rather, slightly, somewhat
VERB + SPOIL
mustn't, not be going to, not want to
We mustn't spoil the surprise by telling them what happens at the end.
be a pity to
Leaving the messy kitchen before guests arrive would be a pity to spoil the good impression.
try to
not let sth
We didn't let a few mistakes spoil our celebration last night.
PREP
with
The grandparents spoiled their grandchildren with special treats and lots of attention.
PHRASES
be completely/thoroughly/utterly spoilt
The teenager was completely spoilt after receiving expensive gifts for every occasion.
spoil sb rotten
Her parents spoil their youngest daughter rotten, buying her whatever she wants.
a spoilt brat/child