be whistling in the darkinformalBRAVE to be trying to show that you are brave when you are afraid, or that you know about something when you do not 故作镇定,虚张声势;不懂乱说 Does he know what he’s talking about or is he just whistling in the dark? 他知道自己在说什么吗?还是只是在吹牛皮?
be whistling in the dark• I'm just whistling in the dark on this one - I could really use some help.
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