> I know the meaning of "careful with money" is "not spending more money than
> you need to".
> But I have seen the phrase "careful of money" in Merriam-Webster's
> dictionary, and what meaning is it?
> The two phrase are the same meaning?
Yes, although the 'of' usage might suggest more knowledge of the
possible threat of money's misuse. It might also just be dialect or
slang.

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"By the life of God, it doth even take my wits from me to think on it!
Here is such controversy between the sailors and the gentlemen, and such
stomaching between the gentlemen and sailors, that it doth even make me
mad to hear it. But, my masters, I must have it left. For I must have
the gentlemen to haul and draw with the mariner and the mariner with the
gentlemen. What! Let us show ourselves all to be of a company and let us
not give occasion to the enemy to rejoice at our decay and overthrow. I
would know him, that would refuse to set his hand to a rope, but I know
there is not any such here." -+Sir Frances Drake