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WordNet
silver cord

n. the emotional bond between a mother and her offspring

Wikipedia
Silver cord

The silver cord in metaphysical studies and literature, also known as the sutratma or life thread of the antahkarana, refers to a life-giving linkage from the higher self ( atma) down to the physical body. It also refers to an extended synthesis of this thread and a second (the consciousness thread, passing from the soul to the physical body) that connects the physical body to the etheric body, onwards to the astral body and finally to the mental body.

In other research, it is described as a strong, silver-colored, elastic cord which joins a person's physical body to its astral body (a manifestation of the physical body that is less distinct).

Alfred Ballabene, an astral projector whose works are mostly published and accessed online, observed that during his out-of-body experiences "glue-like strings" appear as the astral body tries to separate itself from the physical body. As the astral body moves further away from the tangible body, some of the strings break apart and clump into a specific and smaller region - preferably the head, breast, back, stomach, and the abdomen area - thus forming the silver cord.

Some prophets and soothsayers in ancient times also claimed to have seen the silver cord during their out-of-body experiences