crow's foot

1. (usually plural) A small wrinkle in the corner of an eye, emblematic of aging.

   • So longe mote ye live, and alle proude,/Til crowes feet be growe under your eye

   • 1814 July, [Jane Austen], chapter XV, in Mansfield Park: A Novel. In Three Volumes, volume I, London: Printed for T[homas] Egerton, […], OCLC 39810224 ↗, pages 305–306 ↗:

     You must get a brown gown, and a white apron, and a mob cap, and we must make you a few wrinkles, and a little of the crowsfoot at the corner of your eyes, and you will be a very proper, little old woman.

     The Food and Drug Administration says it's an effective temporary treatment for crow's feet, the wrinkles that form next to aging eyes.

2. (sewing) A triangular embroidery stitch.
3. (databases) A symbol, resembling a bisected equilateral triangle, used in database diagrams to indicate plurality.
   • 2007, Geoff Coffey, Susan Prosser, Filemaker Pro 9: The Missing Manual‎

     Each crow's foot in your ER diagram indicates the need for a foreign key.

4. A number of lines rove through a long wooden block, supporting the backbone of an awning horizontally.
5. A caltrop.
6. A device for supporting a tripod to prevent the legs from slipping.