stick down

verb3

1. •
   To cause to stick to a surface.

   • I can't stick this picture down. I need better glue.
2. •
   to stick to a surface.

   • Eventually the plaster stuck down on my arm.
3. •
   To write something casually.

   • If you don't know the answer, just stick down any old thing: you might get a mark for it.