Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ĭn-ambŭlo, āre, v. n., to walk up and down, pace to and fro (class.): paululum in porticu, Cic. Rep. 1, 2: in viridi opacaque ripa, id. Leg. 1, 5, 15: domi, id. Att. 6, 2, 5: cum quidam pransus … manibus ad tergum rejectis inambularet, Asin. ap. Cic. Fam. 10, 32, 3: per muros, Liv. 23, 43, 8.
Impers.: inambulandumst, Plaut. As. 3, 3, 92.