spider
蛛 centers on spiders, the eight-legged arachnids that spin webs.
蛛 combines 虫 (insect/bug) with 朱, which likely contributes the sound. Together they specify a spider, a bug-like creature.
The insect radical 虫 beside 朱 (a red color) suggests a red insect. Picture a red spider spinning its web.
For チュ, imagine a spider chewing on its prey: chew -> チュ, and the spider (蛛) is the one doing the chewing.
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spider
spiderweb; spider web; spider's web; cobweb
jorō spider (Trichonephila clavata)
Atypus karschi (Asian species of mygalomorph spider)
huntsman spider (Heteropoda venatoria)
redback spider (Latrodectus hasselti)
fire crab (Pyromaia tuberculata)
Atypus karschi (Asian species of mygalomorph spider)
tarantula (any spider of family Theraphosidae)
golden web spider (Nephila pilipes)
common house spider (Achaearanea tepidariorum)
Parasteatoda japonica (species of tangle-web spider)
wolf spider (any spider of family Lycosidae)
dewdrop spider (any spider of genus Argyrodes)
Uroctea compactilis (species of araneomorph spider)
prostrating oneself
pholcid spider (any spider of family Pholcidae, esp. species Pholcus crypticolens)
widow spider (of genus Latrodectus)
trapdoor spider (any spider of family Ctenizidae); folding trapdoor spider (any spider of family Antrodiaetidae)
Nephila clavata (Oriental species of golden orb-weaving spider)