primary responsibility
noun phraseUK /ˈpraɪ.mə.ri rɪˌspɒn.sɪˈbɪl.ə.ti/
US /ˈpraɪ.mer.i rɪˌspɑːn.səˈbɪl.ə.t̬i/
The main job or duty that you must take care of first.
Feeding the class pet is the primary responsibility of the student helper.
RELATED WORDS
OTHER MEANINGS
2. The most important thing a person is expected to do at work.
Her primary responsibility is to keep the office safe.
3. The first job that must be done before anything else.
The primary responsibility of a lifeguard is watching the swimmers.
4. The main thing someone is trusted to take care of.
A parent's primary responsibility is caring for their child.