What does "the first bid" mean?
The sentense is "Together we are the first bid". It was said by a prime-minister after introducing the persons sitting around.
What is "the first bid" ?

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Dmitry -- It means that together, they are the first try at something. The "first bid" is the first offer you make when trying to negotiate a price.

So he was using a metaphor -- he was comparing that group to the first offer at solving a problem.

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Hello Dmitry,
One meaning of first bid is the first formal proposal to buy at a certain price in an auction, but it is not the correct meaning in this context.
In the context of a prime minister introducing persons( probably ministers) sitting around in a meeting it could rather mean:
"we are the first authoritative direction to take decision or do something".

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The first offer at auction.