钉

釘
dìng
  1. to join things together by fixing them in place at one or more points
  2. to nail
  3. to pin
  4. to staple
  5. to sew on

CEDICT

Homographs

钉 dīng
  1. nail
  2. to follow closely
  3. to keep at sb (to do sth)
  4. variant of 盯 dīng