in thrall

in thrall

1. Very interested in and/or paying close attention (to something). I was thrilled to see my students in thrall during the assembly, instead of talking or passing notes.
2. Under one's or something's control or influence to an extreme degree. My daughter's new boyfriend has her totally in thrall. She seems to go along with everything he says.

in (somebody’s/something’s) ˈthrall

,

in ˈthrall to somebody/something

(literary) controlled or strongly influenced by somebody/something: The country’s economy is still largely in thrall to the big companies.