The meaning of Selah in the psalms

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Selah is an untranslated Hebrew word of uncertain meaning found in the Psalms.

My impression is that Selah means something like "Reflect on this" - or more prosaically "Think about it!".

This would fit with the notion that the chanting of the psalm may have been interrupted at this point by a 'harp' stroke.

Any other bright ideas what it means?

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