be off at the nail

• 举止失常

be off at the nail的用法和样例：

例句

1. These are trifling instances, though it's to no commander's advantage to be suspected of ludicrous eccentricities.
   身为指挥官，却被怀疑举止失常，荒唐可笑，虽然与己不利但这些毕竟还是小事。
2. Hearing the death of her son, Jennifer came apart at the seams.
   听到儿子的死讯，詹妮弗一下子神经失常了。