Settle down to (something) verb phrase
To pay your full attention to something you are doing
After putting the children to bed, I settled down to cooking and cleaning the house.
There are too many distractions that prevent you from settling down to work.
To daydream
Used to to emphasize that attention is paid to the individuals who complain or cause problems
Push someone with your finger or elbow to get their attention
Everybody, pay attention to me.
Pay attention to someone or something
The verb “settle" should be conjugated according to its tense.
If someone has a cast iron stomach, they have a strong stomach that can digest unusual food and even bad food without being ill.
Jimmy must have a cast-iron stomach, when he drank milk with lime juice and felt perfectly fine afterward.