the.com/roadblock

means An obstacle or barrier — literal or situational — that stops progress and forces you to find another way through.

from A straightforward 19th-century compound of 'road' plus 'block,' built the same way as other obstruction words of its era — something literally blocking a road, like a barricade or checkpoint. It stayed mostly physical (troops, protests, checkpoints) until the 20th century, when it widened into the figurative sense we lean on now: anything — a rule, a person, a bad mood — that stands in the way of getting somewhere.