When thou goest
yalak (yaw-lak')
to walk; causatively, to carry (in various senses)
thy steps
tsa`ad (tsah'-ad)
a pace or regular step -- pace, step.
shall not be straitened
yatsar (yaw-tsar')
to press (intransitive), i.e. be narrow; figuratively, be in distress -- be distressed, be narrow, be straitened (in straits), be vexed.;
and when thou runnest
ruwts (roots)
to run (for whatever reason, especially to rush) -- break down, divide speedily, footman, guard, bring hastily, (make) run (away, through), post.
thou shalt not stumble
kashal (kaw-shal')
to totter or waver (through weakness of the legs, especially the ankle); by implication, to falter, stumble, faint or fall