plodded

/P L AA1 D AH0 D/
verb
  1. 1

    To walk or move slowly and heavily or laboriously (+ on, through, over).

  2. 2

    To trudge over or through.

  3. 3

    To toil; to drudge; especially, to study laboriously and patiently.

Source: https://en.wiktionary.org/wiki/plod, https://en.wiktionary.org/wiki/plodded