This is the 14885th most frequent Russian word.
погреться
"Погреться" means "to warm oneself up."
The word 'погреться' is used here in its primary meaning, to warm oneself, exemplifying a personal action for comfort.
Я сел у костра, чтобы погреться.
I sat by the campfire to warm myself up.
This usage of 'погреться' indicates seeking warmth indoors, often combined with an activity such as having a drink.
Мы зашли в кафе, чтобы немного погреться и выпить кофе.
We entered the cafe to warm up a little and have some coffee.
Here, 'погреться' is used metaphorically to describe returning to a comfortable state or environment after exposure to cold weather.