Offered an opportunity to participate, with the understanding it is a requirement.

to be volunteered, usually by your wife, for an undesirable task that you must grin and bare.

an action that was suggested for you by someone else

A made up word by a teacher I have. If someone volunteers someone else, it means that you are the one presenting if you’re in a group for a project.

being involuntarily volunteered to perform a job or task as a result of being absent from a business meeting

To take it upon yourself to volunteer someone for a task or duty, that you think would be exceptional at performing or completing, and informing them of your decision later.

You have been told by someone else to volunteer for something that the person suspects you will agree to although you have not really volunteered for it.