ausüben in English:

What do they understand by full discharge of duties?

He received an honorable discharge from the army.

the discharge of a watery exudation dries up leaving the skin covered with crusts

I have to discharge my duty.

The factory discharged sewage straight into the river polluting it.

The crowd obstructed the police in the discharge of their duties.

a discharge can signify:

Patients were discharged from the hospital because the beds were needed by other people. More than half of all prisoners discharged are reconvicted within two years.

if a wound or body part discharges a substance such as pus (=infected liquid), the substance slowly comes out of it

You can't discharge me.

Agreement has been discharged

He was discharged from the hospital.

He discharged all his debts before he died.

The oil which discharged into the sea killed a lot of animals. 

The midwife will come and see you after your discharge.

In order to lose weight, you need to exercise.

In order to lose weight, you need to exercise and keep diet.