Someone stops と（まる） moving when they run into a wall. (from a student of Notre Dame High School in California)
(Contributed by: Kazumi Hatasa of Purdue University on 12/1/06)
If you are about to run into a wall, you should STOP.
(Contributed by: H to the UNTER of NDHS on 9/6/07)
It looks like a crossing guard stopping traffic so a child can cross the street.
(Contributed by: Danielle Colie of Eastern Michigan University on 12/1/08)