heedless let down [lower] one´s guard (对某种问题漫不经心,不当回事) let down [lower] one´s guard; be rid of sth. to lighten one´s heart; dismiss the thought of the matter, etc. as unworthy of further attention; take [adopt] a casual attitude treat sth. lightly dismiss the thought of the matter, etc. as unworthy of further attention be rid of sth. to lighten one´s heart take a casual attitude let down one´s guard treat lightly
You are valuable to the organization, you mustn´t take chances.
组织上对你很器重, 你不得掉以轻心。
—— 给力词典精选This struggle is sharp and complex. We can never let down guard.
这场斗争是尖锐复杂的, 我们决不能掉以轻心。
—— 给力词典精选We must under no circumstances take this lightly.
这事儿千万不可掉以轻心。
—— 给力词典精选Confident as I am that you will not trifle with this appeal.
我对你充分信任,相信你不会对我的请求掉以轻心。
—— 辞典例句Dangers from abroad are not less deserving of attention.
我们也不能对来自国外的危险掉以轻心。
—— 辞典例句