I study with a dictionary at hand.
All the necessary documents are on hand.
money on hand; cash at hand; pocket money
Specifically refers to money one currently has available. Often used in financial or everyday contexts.
I have almost no cash on hand.
I have a dictionary at hand, so I can look it up right away.
I watched the teacher's hands and learned how to cut it.
I don't have any money on hand right now, so I can't pay.
The handle of the umbrella got slippery in the rain, which was dangerous.
I always keep important documents close at hand.