plural of George Best

(Cockney rhyming slang) The face.

Lessons learned from experience are the most lasting.

An affectionate term for a dog, or dogs in general.

(idiomatic) A proverbial expression used to signify the futility of making detailed plans when the ability to fully or even partially execute them is uncertain.

(mathematics) A line on a scatter plot that best defines or expresses the trend shown in the plotted points. It is chosen so that the sum of the squares of the distances from the points to the line is a minimum. It also illustrates the correlation (positive, negative, or zero correlation) between the plotted variables.

(idiomatic, singular only) A combination of two seemingly contradictory benefits.

To have one's best possible appearance.

Used when someone's mistakes or flaws are acknowledged, as a reminder that everyone makes mistakes and has flaws.

(optics) A lens that is designed to minimize spherical aberration.