walk, walking, road radical (no. 162)
辵 centers on the act of walking or moving along a path. It is primarily known as the road or movement radical used in other characters, so its standalone meaning is tied to that idea of walking and roads.
辵 is an ancient pictograph combining 彳 (a step with the left foot) and 止 (a foot), representing walking or movement along a path. The modern form is a stylized version of this combination.
The top part looks like a stylized step, and the bottom part 止 means 'stop' or 'foot'. Together they suggest a foot stepping forward along a road: walking.
For チャク, imagine a person walking down a road while wearing a distinctive 'chalk' (チャク) colored jacket. The chalk color cues チャク as they walk along.