WordNet sense 1 (manner of walking):

manner of walking

WordNet sense 2 (a path set aside for walking):

walkway, paseo

WordNet sense 3 (take a walk; go for a walk; walk for pleasure):

take the air

WordNet sense 4 (careers in general):

walk of life

WordNet sense 5 (the act of traveling by foot):

walking

WordNet sense 6 ((baseball) an advance to first base by a batter who receives four balls):

pass, base on balls