constriction, bottleneck, chokepoint
Meaning: a narrowing that reduces the flow through a channel
Nervousness and mental strain are common sources of mouth and throat constriction, so make the battle for poise and self-confidence for which we pleaded in the opening chapter.
The judge sat quiet, but the sergeant who dared not peer too closely, noticed a sudden constriction in the fingers of the hand with which his host fingered a paper-cutter lying on the table between them.
Or the almost undefinable organic troubles revealed to us by the singing in the ears, constriction of the epigastrium, the jerks, the trembling, vertigo, or nausea--all this collection of organic troubles which comes more or less confusedly to our consciousness under the form of tactile, muscular, thermal, and other sensations.