This is the 6340th most frequent Korean word.
아래서
"아래서" means "under" or "beneath."
Here, '아래서' is used to indicate a spatial position—'below' or 'underneath'—to describe the location of the cat relative to the desk.
책상 아래서 고양이가 자고 있어요.
The cat is sleeping under the desk.
In this sentence, '아래서' describes the area at the base of the tree where the action of conversation took place.
나무 아래서 우리는 함께 이야기를 나누었어요.
Under the tree, we had a conversation together.
'아래서' here specifies the location beneath the shadow as a place of relief from the heat.