noun
guiding star - a star that provides direction or guidance, often used metaphorically to represent something or someone that provides guidance or inspiration
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The North Star has long been used as a guiding star for sailors navigating the seas.
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She's like my guiding star, always leading me in the right direction.
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My best friend is my guiding star, she always knows what's up.
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In times of uncertainty, music has been my guiding star, helping me find my way through life.