Phrase: Cross my mind. Cross my finders

[mrfreak23]

What is the meaning of these pharses & what is the origin?

1. Keep fingers crossed
2. Cross ones mind. [e.g. I crossed my mind]

Please elaborate.

[Pete]

What is the meaning of these phrases & what is the origin?
Please elaborate.

1. Keep fingers crossed
This usually refers to the superstition that crossing your fingers (almost always two adjacent fingers of the same hand, most often the pointer finger and the middle finger), will bring good luck. Thus you might say,
- I'm going to take my English exam this afternoon; keep your fingers crossed. (You are hoping for good luck so that you will know the answers to the questions on the test.)

A Google search found several places on the Internet that speculated that this superstition had its origins in the Christian sign of the cross. If that is true, crossing one's fingers no longer appears to have this association.

Another use of crossed fingers (probably unrelated) is to make it all right to tell a lie. In my experience, only young children actually appear to believe this, but anyone may refer to the tradition. For example,
- I know he told her that he loved her, but I'll bet he had his fingers crossed when he said it. (You mean that you think he was lying.)

I have no idea where this tradition came from.

2. Cross ones mind. [e.g. I crossed my mind]

I think this is a simple analogy. If something crosses (= moves across) your field of vision, you suddenly see it. Similarly, if something "crosses your mind", you suddenly think of it. Generally you can't say what made you think of it.

- It crossed my mind that you haven't visited us recently; would you come for dinner Tuesday?

(Note that your example, "I crossed my mind", does not sound like a natural use of this idiom.)