Used other than figuratively or idiomatically: see step, on.
to adulterate a drug for the purpose of increasing its bulk, and therefore its profit; to dilute, cut.
to walk about or over (a place) aimlessly or insouciantly.
To travel with purpose; usually a significant or tedious amount.
To walk (a distance or journey) wearily or with effort
To walk about, especially when expending much effort, or unnecessary effort.
A long or tiring walk.
A meandering walk.