gnash
[næʃ]
vt.
咬（牙）;
vi.
（牙）磨咬;
上下叩击;
（尤指因没有得偿所愿而）咬牙切齿;
非常愤怒（或沮丧）;
例句:
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Father is knitting brows closely , bit gnash one's teeth agree.
父亲紧皱着眉头, 咬咬牙答应了.
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There has been much gnash of teeth over the new legislation.
不少人对新法规感到愤愤不平.
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Your gnash one's teeth says: Upstairs corridor falls!
你咬牙说: 楼上过道摔下来的!
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But Gnash is under heavily development today, and needs support.
来自BBC
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Poland has certainly felt the "gnash" of Russian teeth in the past.
来自BBC
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What's more, he added, Russia should not "gnash its teeth at anyone, get angry, sulk or feel offended".
来自BBC