«مَا لَكْ وِالْخِيطِ الْمِعَلَّقْ؟»

Framed as a rhetorical question, the saying warns against involvement in an affair bound up with other affairs. The 'dangling thread' suggests something that hangs on, and depends on, other things. Such a matter tends to bring worry and wasted effort, so the speaker asks why anyone would take it on.

It also carries positive advice: prefer what is clear, settled, and free of strings. Instead of chasing something uncertain and entangled, a sensible person keeps to straightforward matters whose results are in their own hands and that will not drag them into needless trouble.

Say this to someone tempted to take on a complicated affair whose outcome hinges on other people or unsettled conditions. It is not a genuine question but friendly, slightly reproving advice to stay out of tangled business and stick to matters that are simple and fully one's own.