Several comments mention guessing games. Here's my variant:

One "communicator", one or many askers.

The communicator starts by describing something in the most general terms they can think of.

Each round, the asker(s) can either ask a question, or guess. The question has to be about an attribute of the thing, not its name, and they can't say "Is it X?" or "What is it?". The communicator answers, vaguely if the question is vague, getting specific if they're backed into a corner.

When they guess, the game is over. If they guess wrong, they lose. Then you try to figure out what your next question should have been.

If they guess right, they win and get congratulated.

"It's a way of moving things from place to place."

"What kinds of things?"

"Oh, things you want moved."

"How big can these things get?"

"No more than six feet high, a couple feet wide, less than a foot long."

"Are they inert and durable?"

"No."

"Are they fragile?"

"Depends on your standards."

"Would they break if you dropped them from a foot?"

"No."

"From ten feet?"

"Possibly."

"What materials are they made from?

[...]

Eventually the guesser figures out that you're moving people, one at a time, with no equipment except the person's own legs.

"I know! Walking"

"WRONG - you forgot to ask if the person's feet are ever both off the ground, and whether their posture is upright or at an angle. Could have been leaping or running."