mid-15c., "action of flowing," from flow (v.). Meaning "amount that flows" is from 1807. Sense of "any strong, progressive movement comparable to the flow of a river" is from 1640s. Flow chart attested from 1920 (flow-sheet in same sense from 1912). To go with the flow is by 1977, apparently originally in skiing jargon.
Go with the flow, enjoy the forces, let ankles, knees, hips and waist move subtly to soak up potential disturbances of acceleration and deceleration. [Ski magazine, November 1980]
1550s, "little tuft," from Old French touffel (with diminutive suffix -et for French -el), diminutive of touffe (see tuft). Obsolete except in the nursery rhyme "Little Miss Muffet" (1843), where it has been felt to mean "hassock, footstool."
LITTLE Miss Muffet
Sat on a tuffet
And made of her knees such display
That the old fashioned spider,
Embarrassed beside her,
Was actually frightened away!
[Life magazine, Oct. 1, 1927]
late 14c., marybones (late 13c. as a surname), "bone containing fat or marrow," from marrow + bone (n.). A poetic Old English word for "bone" was mearhcofa "marrow-chamber." Later generally of any large bone. The conjecture that it is a corruption of Mary-bones, in allusion to the reverence paid to the Virgin Mary by kneeling "is absurd" [Century Dictionary]; nonetheless, marrowbones is used especially to mean "the bones of the knees" (1530s). To ride in the marrow-bone coach was one of many terms in old slang for "to go on foot."