Used when referring to unintentional, usually minor, physical contact with objects or people. Walking through the crowded room, I kept bumping up against guests.
Pro Tip 2/3
Slight Collision
Emphasizes a gentle or accidental collision, not a forceful impact. She bumped up against her desk, barely noticing the papers that fell.
Pro Tip 3/3
Unintended Movements
Often happens when moving without paying full attention, like in the dark or while distracted. He accidentally bumped up against the switch, turning off the lights.