What do horizontal lines cutting the sun line mean?

Short answer: Horizontal lines cutting the sun line usually mean pressure, interruption, criticism or delay around recognition, creative work or visible output. They are not a fixed bad sign by themselves.

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Read my palm
A close view of the middle of a palm, with the three long creases easy to see

What this means

First confirm that one or more short lines actually cross the sun line below the ring finger, rather than just touching it or forming a true cross.

A light bar can suggest a small interruption, while repeated deep bars may point to stronger outside pressure or stop-start visibility.

Read whether the sun line continues clearly after the cut, plus nearby islands, crosses, the fate line, head line and both hands.