baaa~aaaad boy! :)


Here’s a possibility:

Derived Forms of noun coil
2 of 6 senses of coil
Sense 1
coil, spiral, volute, whorl, helix -- (a structure consisting of something wound in a continuous series of loops; ``a coil of rope'' ) RELATED TO->(verb) coil#1
• gyrate, spiral, coil -- (to wind or move in a spiral course; ``the muscles and nerves of his fine drawn body were coiling for action"; "black smoke coiling up into the sky"; "the young people gyrated on the dance floor'' ) RELATED TO->(verb) coil#3
• coil, loop, curl -- (wind around something in coils or loops)
Sense 2
coil, whorl, roll, curl, curlicue, ringlet, gyre, scroll -- (a round shape formed by a series of concentric circles) RELATED TO->(verb) coil#1
• gyrate, spiral, coil -- (to wind or move in a spiral course; ``the muscles and nerves of his fine drawn body were coiling for action"; "black smoke coiling up into the sky"; "the young people gyrated on the dance floor'' ) RELATED TO->(verb) coil#3
• coil, loop, curl -- (wind around something in coils or loops)

http://poets.notredame.ac.jp/cgi-bin/wn?cmd=wn&word=coil

In other words, I think Shakespeare took the sense of something being in motion when being coiled, and transferred the sense into a noun representing the idea of vigorous motion, and hence a disturbance.