杞人忧天

like the man of Qi who feared that the sky might fall—entertain imaginary or groundless fears

♦ 这岂不是~吗？ Isn't this a case of the man of Qi worrying lest the sky fall?

♦ 事情未必如他所说的那么可怕, 也许完全是~。 Things may not be as bad as he says. Maybe he is merely imagining things.