钉

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

CEDICT

Homographs

钉 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