v. 1 tr. make or become fixed or secure. 2 tr. (foll. by in, up) lock securely; shut in. 3 tr. a (foll. by on, upon) direct (a look, thoughts, etc.) fixedly or intently. b focus or direct the attention fixedly upon (fastened him with her eyes). 4 tr. (foll. by on, upon) fix (a designation or imputation etc.). 5 intr. (foll. by on, upon) a take hold of. b single out. fastener n.
[ OE fstnian f. Gmc ]