Familiarize yourself with LIBOR (London Interbank Offered Rate). When the rate begins to creep up, it’s an indicator of an unwillingness to lend.
The lending referred to in this instance is between banks. That it’s beginning to freeze up again is an indicator of increasing lack of trust, from one bank to another.
This is after having improved the situation to some approximation of “normal” since the credit freeze last fall, due to various actions by the Fed, foreign central banks, and government funding by various governments.
There aren’t too many more rabbits left in the hat, so this one is potentially very problematic.