Wiktionary
hang on every word
vb. (context idiomatic English) To be completely attentive to what another person is saying.
Usage examples of "hang on every word".
Master Li tersely explained what had transpired, and Yen Shih appeared to hang on every word.
Lemelisk noted that, though the alien reacted little, Ackbar seemed to hang on every word Tarkin said, as if storing information for whatever possible use a slave might make of it.
When such a person is aged, they will still sit through the same basic lessons, still hang on every word.
Despite the length of the rabbi's message, Buck knew that if the rest of the constituency was as thirsty for the truth as he was, they would welcome it and hang on every word.