This is the 10335th most frequent Japanese word.
駄々
Childish tantrum or whining.
In this sentence, '駄々をこねる' means 'to throw a tantrum,' typically used to express the behavior of children being stubborn or difficult.
子供が駄々をこねているので、困っています。
The child is throwing a tantrum, so I am in trouble.
Here, '駄々' refers to persistent requests or stubborn behavior aimed at getting what one wants.
彼の駄々に負けて、プレゼントを買ってあげた。
I gave in to his stubborn pleading and bought him a present.
In this context, '駄々を言う' suggests complaining or resisting doing something when told.