the.com/separator

The line that lets two things touch without ever having to talk.

means A thing, person, or part that keeps two other things apart or divides something into distinct pieces.

from Straightforward Latin ancestry: separare, 'to pull apart' — from se- (apart, aside) plus parare (to make ready, to prepare). English borrowed 'separate' in the 1400s, and the agent-noun 'separator' followed once machines and mechanisms started doing the pulling-apart for us — cream separators, egg separators, the little tab in a binder.

egg use
splits yolk from white, cleanly, no drama
cream variety
spins milk fast enough to exile the fat
code syntax
commas and semicolons doing all the social work
etymology
from latin separare, to set apart forever
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