[be|feel] obliged {to do sth}

to have a moral duty or be forced to do a particular thing, often due to legal reasons

After receiving such generous help from her neighbor, she felt obliged to return the favor by watching their pets while they were away.
He always feels obliged to attend family gatherings, even when he's busy, because he values spending time with his loved ones.
As a responsible pet owner, you may be obliged to clean up after your dog when walking in public areas.
Employees are obliged to follow workplace safety protocols to ensure a secure environment for themselves and their colleagues.
After receiving excellent service at the restaurant, she felt obliged to leave a generous tip to show her appreciation.

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