least common denominator

noun
1
the smallest number that the bottom numbers of a group of fractions can be divided into exactly
کمترین مخرج مشترک, کوچک‌ترین مخرج مشترک
2
something that is simple enough to seem interesting to, or to be understood by, the highest number of people in a particular group; the sort of people who are least intelligent or accept something that is of low quality
کمترین وجه مشترک, حداقل مخرج مشترک, پایین‌ترین سطح مشترک