snag
UK[snæɡ]US[snæɡ]
n
An unexpected or hidden obstacle or drawback.
n
A sharp, angular, or jagged projection.
v
To catch or tear something on a sharp projection.
v
To succeed in obtaining or achieving something, especially with difficulty or by a quick action.
Etymology
The word 'snag' entered English in the late 16th century, likely borrowed from a Scandinavian source such as Old Norse snagi, meaning a 'clothes peg' or 'a short projecting point'. Its core semantic thread is a sharp, projecting point. This concrete meaning evolved naturally into the verb for catching on such a point. The modern abstract sense of an 'unexpected obstacle' is a metaphorical extension from the physical object that catches and impedes progress, much like a hidden branch in water could snag a boat or fishing line. The informal meaning 'to obtain quickly' plays on the idea of catching or seizing something deftly.
Analysis
This word is a simplex of Scandinavian origin. It functions as a single, unanalyzable morpheme in modern English.
Examples
The only snag is that we need to get approval by tomorrow.
Her sweater snagged on a nail.
He managed to snag the last ticket to the concert.