A MUST
a must: translation
{n.} 1. An inevitability; a necessity. * /Visas in many foreign countries are a must./ 2. An extremely interesting or memorable event, such as a free concert given by an international celebrity. * /Alfred Brendel's Beethoven master classes are open to the public and are not to be missed; they're a must./- a must—обязательная вещь...Англо-русский универсальный дополнительный практический словарь И. Мостицкого