obligation
Obligation is when you nod like you understand, but you’re just trying to get out of a situation you don’t want to be in.
I nodded when she asked if I’d help her with her taxes. I now have a headache and a $1000 bill I can’t afford.
He nodded when I asked him to help me move. Now he’s carrying my fridge up the stairs like it’s a damn Olympic event.
She nodded when I asked her to come to the party. She brought six of her friends and a portable karaoke machine.