A shield protects a soldier. David speaks as if God were a shield protecting him. AT: "you, Yahweh, protect me like a shield" (See: [[rc://en/ta/man/translate/figs-metaphor]])
"you are my glory." By calling God his glory, David says that God is the one who gives him glory. Since David has just spoken about his enemies and God being his protector, he probably meant that God gives him glory by giving him victory over his enemies. AT: "you are the one who gives me glory" or "you are the one who gives me victory" (See: [[rc://en/ta/man/translate/figs-metonymy]])
"you are the one who lifts up my head." Giving someone courage is spoken of as lifting up his head. AT: "the one who encourages me" (See: [[rc://en/ta/man/translate/figs-metaphor]])
This may be a musical term that tells people how to sing or play their instruments here. Some translations write the Hebrew word, and some translations do not include it. See how you translated this in ([Psalms 3:1](./001.md)). (See: [[rc://en/ta/man/translate/translate-transliterate]])
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