• 連絡れんらく — contact; communication
• 絡むからむ — to get entangled; get involved
• 絡まるからまる — to become entangled
• 絡めるからめる — to entwine; twine around
• 短絡たんらく — short circuit; simplistic (thinking)

絡 combines the thread radical 糸 with a component meaning “each.” Picture threads touching each thing and winding around them — that’s the feel of being entangled, connected, intertwined. From there, it also extends to keeping in touch, as in 連絡れんらく.