The verb 'to margin'

[Elenaflory1]

Hello!

Could you help me understand the verb 'to margin'? I think it is often use in a financial context, with the meaning of depositing a provision of money against loss on transactions. Am I correct? Please provide some examples.

Thank you in advance for always helping me! :)

[Mister Micawber]

Here is what the dictionary says:

MARGIN
15.
(Finance.) to deposit a margin upon.
16.
(Stock Exchange.) to purchase (securities) on margin: That stock was heavily margined during the last month.

Not having any money, I am not familiar any further with its use.
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Native English teacher at Mister Micawber's