수속이 · 수속을
procedure, formalities (check-in, paperwork)
Example
공항에 일찍 가서 출국 수속을 했어요.
I went to the airport early and went through departure procedures.
Word parts
수 hand+속 continue
The parts read 'hand + continue,' which doesn't help; just learn it as 'official steps.'
Good to know
Common collocations: 출국 수속, 탑승 수속, 입원 수속 — all with 수속을 밟다/하다.