finger/ 'fɪŋgər /

1.noun [c] [解剖] 
手指

2.vt.
(touch) 触摸

to keep one's fingers crossed
 [fig] 祈愿好运
to cross one's fingers
食指与中指交叉重叠
to point the finger at sb
 [fig] 指责某人
to put one's finger on sth
 [fig] 对某事有充分把握