1) Clump 2) Hike 3) Hike wearily 4) Long tiring walk 5) Lumber 6) March laboriously 7) Participate in a forced march 8) Plod 9) Plod along 10) Ramble 11) Roam 12) Rove 13) Slog 14) Stroll wearily 15) Struggle through snow 16) Trail 17) Traipse 18) Tramp 19) Travel with difficulty 20) Tread wearily 21) Trek Found on https://www.crosswordclues.com/clue/trudge