1
http://www.merriam-webster.com/dictionary/wriggleintransitive verb
3
: to extricate or
insinuate oneself or reach a goal as if by wriggling transitive verb
2
: to introduce, insinuate, or bring into a state or place
by or as if by wriggling [M-W's Col. Dic.]
I don't understand the underlined parts. What does "wriggling" suggests in those pieces? How can one insinuate, introduce, or reach a goal by something suggestive of wriggling? Please guide me.