To grossly exaggerate or magnify a small matter; to blow things out of proportion.
他说话总喜欢添油加醋，把一点小事说得一尺水翻腾做一丈波，让人觉得不可信。
He always likes to embellish his stories, exaggerating minor details as if one foot of water churns into a ten-foot wave, making people find him unreliable.
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