Noun:
задължение, трябва, назначение, функция, труд, отговорност, зареждане, тежест, данък, тарифа, щука, налог, по-ниска цена, термин, убедителен, мотив, задача, задължителен, императив, фуния, кранче, октроато, тръба, комин.
and I've always done my DUTY.
It is our DUTY and our honor
Dereliction of DUTY in the face of the enemy is a court-martial offense.
It was his DUTY. He never liked it.
I believe you both have guard DUTY tonight.