Shalt/ʃælt/ Definition 1 of 1Pro Tip 1/3Biblical Command Used in religious contexts, often in the Bible's Ten Commandments. Remember the sabbath day, thou shalt keep it holy. Pro Tip 2/3Archaic Tone Conveys a solemn or formal tone, usually found in historic texts. Thou shalt honor thy father and thy mother. Pro Tip 3/3Poetic Flair Sometimes used in poetry or literature to give an old-fashioned or classical feel. Thou shalt find peace amongst nature's bounty.