hang upon

verb4

1. •
   To regard with passionate affection.

   • Beshrew the eyes that hung upon his form on that day with a passionate, greedy, all-absorbing love! — 1916
2. •
   To pay overt attention to, as from sycophancy or intense interest.

   • They hung upon his every word.
3. •
   To depend upon.

   • Everything hangs upon whether the boss agrees.
4. •
   To hover around.

   • and it was therefore decided merely to take precautions against a raid, fortify certain points on the roads, and bring out a host of irregulars to hang upon the rear and flanks of the enemy — 1919