plod

Short definition from Wiktionary

Noun

1. 1
   A slow or labored walk or other motion or activity.
2. 2
   A puddle.
3. 3
   the police, police officers
4. 4
   a police officer, especially a low-ranking one.

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.
4. 4
   To extrude (soap, margarine, etc.) through a die plate so it can be cut into billets.