a concealed or unexpected difficulty or obstacle

The snag is, there's no train on Sundays

a sharp or jagged projecting part

an irregular tear or flaw made by or as if by catching on a snag

a snag in her tights

to catch (something) on or as if on a snag

to clear (e.g. a river) of snags

chiefly NAmer to halt or impede (something)

chiefly NAmer to catch or obtain (something) by quick action

I snagged a taxi

to become snagged