闯 has two main uses: (1) to rush/barge through something (闯红灯 = run a red light, 闯进 = barge in); (2) to venture out and build experience (闯荡 = venture out into the world, 闯出名堂 = make a name for oneself).
memory
The character has 门 (door) with 马 (horse) inside — a horse charging through a door. This vividly captures the meaning of rushing through barriers.
