…부터 줄곧 + continuing action
all along, the whole time, constantly
Example
그는 아침부터 줄곧 컴퓨터 앞에 앉아 있었어요.
He's been sitting in front of the computer ever since this morning.
Word parts
Probably 줄 'line' plus 곧다 'straight' — going on in one unbroken line.
Related words