This is the 2702nd most frequent Swedish word.
syna
To inspect, examine, or scrutinize.
Here, 'syna' is used to mean inspect something closely, often in detail.
Jag synade korten noggrant.
I inspected the cards carefully.
In this context, 'syna' refers to challenging or exposing someone's bluff, commonly in poker or figuratively.
Han synade motståndarens bluff.
He called the opponent's bluff.
Here, 'syna' implies analyzing or examining critically to identify issues.