night school

:  the time from dusk to dawn when no sunlight is visible

:  an evening or night taken as an occasion or point of time

:  an evening set aside for a particular purpose

:  of, relating to, or associated with the night

:  intended for use at night

:  existing, occurring, or functioning at night

:  an organization that provides instruction: such as

:  an institution for the teaching of children

:  college, university

:  to teach or drill in a specific knowledge or skill

:  to discipline or habituate to something

:  to educate in an institution of learning

:  a large number of fish or aquatic animals of one kind swimming together

:  to swim or feed in a school