A lie which is half a truth is ever the blackest of lies.
真假参半的谎言最险恶。
《新英汉大辞典》
2
A lie is half way around the world while the truth is just putting his boots on.
真理刚穿上靴子，谎言已经在半路了。
3
When the Kremlin wanted to conceal, rather than invent an outright lie, it preferred to mislead by giving out half or a quarter of the truth or say nothing.