"keep sb on the hook"
What does "keep someone on the hook" in this context?

"Keeping the client on the hook by offering choices is a fundamental way of ensuring that the one down feeling of needing help is ameliorated. "

Question

"keep sb on the hook"
What does "keep someone on the hook" in this context?

"Keeping the client on the hook by offering choices is a fundamental way of ensuring that the one down feeling of needing help is ameliorated. "

Answer

It's an idiom for "keeping someone engaged/interested".