noun
snag
SNAG/snæɡ/
An unexpected problem or obstacle.
The move hits a snag when the sofa will not fit through the door.

Etymology
A dangerous tree stump in water became a figurative hidden obstacle or unexpected impediment.
An unexpected problem or obstacle.
The move hits a snag when the sofa will not fit through the door.

A dangerous tree stump in water became a figurative hidden obstacle or unexpected impediment.