Answer: slogged

AnswerCrossword Clue
SLOGGEDWaded through mud
SLOGGEDToiled
SLOGGEDKept on going
SLOGGEDWalked wearily
SLOGGEDPlodded through mire.
SLOGGEDPlodded.
SLOGGEDWalked heavily
SLOGGEDPlodded
SLOGGEDMoved through mud
sloggedSLOG, to plod (to walk heavily)
sloggedto plod heavily
sloggedto work hard