双手紧握可以怎么用英语说？ cross one's fingers什么意思？

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关于双手的几个动作：
Put your hands together. 双手合十。
She clasped her hands together. 她把双手紧握。
Fold one's hands 抱拢双手
She bowed her head and folded her hands in prayer. 她低下头，抱拢双手，开始祈祷。【作揖的手势也可以用fold one's hands来描述。】

请根据下面的英语，说说"fingers crossed"是什么意思？
To cross one's fingers is a hand gesture commonly used to wish for luck. Occasionally it is interpreted as an attempt to implore God for protection.The gesture is referred to by the common expressions "cross your fingers", "keep your fingers crossed", or just "fingers crossed". The act of crossing one's fingers mainly belongs to Christianity. The earliest use of the gesture had two people crossing their index fingers to form a cross.
The use of the gesture is often considered by children as an excuse for telling a white lie. By extension, a similar belief is that crossing one's fingers invalidates a promise being made.