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four score and seven years ago
Eighty-seven years ago. (A "score" is a set of 20 items.) The iconic first line of US President Abraham Lincoln's Gettysburg Address, the speech he delivered at the dedication of the national cemetery in Gettysburg, Pennsylvania. Lincoln gave this speech in 1863—87 years after 1776, the year of the founding of the United States. Four score and seven years ago our fathers brought forth on this continent a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal.
many moons ago
A long time in the past. I used to be quite the athlete, many moons ago.
a while back
At some point in the past. I bought this dress a while back but have never had a chance to wear it.
1. adverb At a point or during a period of time long before the present. I traveled to India so long ago that it feels like a distant dream now.
2. noun A point or period of time long before the present. His poetry is haunted by the myths and memories of long ago.
a while back
Also, a while ago. Some time in the past, as in I ran into Barbara a while back but didn't get her new address, or John wrote me a while ago about his new baby. This term uses a while in the sense of "a short or moderate time," a usage dating from about 1300.
A time well before the present, the distant past. For example, I read that book long ago, or The battles of long ago were just as fierce. [Second half of 1300s]
many moons agoa long time ago. informal
The reference here is to the phases of the moon marking out the months.
many ˈmoons ago(literary) a very long time ago: Many moons ago, when I was young...
1. At a time or during a period well before the present: I read that book long ago.
2. A time well before the present: heroes of long ago.