The core idea
A high bid-to-cover ratio means submitted bids were large relative to the amount of securities offered.
What is happening underneath
It can indicate strong demand, but it does not by itself reveal the quality or price sensitivity of that demand.
How investors should read it
Auction pricing and buyer composition provide important additional context.
The same market move can carry different information depending on which maturity, issuer and risk premium is changing. Read the question together with the underlying concepts rather than treating one price move as a universal signal.