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From The Collaborative International Dictionary of English v.0.48:
Upstroke \Up"stroke`\, n. An upward stroke, especially the stroke, or line, made by a writing instrument when moving upward, or from the body of the writer, or a line corresponding to the part of a letter thus made. [1913 Webster] Some upstroke of an Alpha and Omega. --Mrs. Browning. [1913 Webster]