Tense
The servant sits on a stool, holding a piece of thread, looking very tense.
You walk by this tense servant and pause for a moment. They raise their tense eyes up at you and you can see they're shaking.
きん
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You ask the servant why they're so tense, and they say they've been assigned to assassinate the King (きん) of England with this piece of thread.
Imagine how tense you would be if you were about to try to murder the King! Your entire body would tense up, maybe to the point that you wouldn't be able to actually go through with it.