Literally to walk around (peri + pateo). Paul transforms this ordinary verb into the standard metaphor for the Christian life: how one 'walks' is how one conducts oneself daily. The Hebraic background is halakhah (from halak, to walk) — the way a person orders their daily steps.
Paul's letters are structured around the walk-metaphor. 'Walk worthy of your calling' (Eph 4:1). 'Walk in love' (Eph 5:2). 'Walk in the Spirit' (Gal 5:16). 'Walk in the light' (1 John 1:7). The verb frames Christianity not as a system of beliefs alone but as a way of life — every step is either in step with the Spirit or out of step. Colossians 2:6 ties it all together: 'As you received Christ Jesus the Lord, so walk in him.'