These are three different verbs that share dictionary form. Beware that they are conjugated differently due to their different meanings.
Dictionary form – polite present tense – English infinitive
걷다 – 걸어요 – To walk
걷다 – 걷어요 – To roll up (e.g. your sleeves)
걷다 – 걷어요 – To take down clothes from a drying line (yes, this is a very specific usage of 걷다)