裂け目

1. Origins, structure, and basic meaning

• Structure: 裂け目, read さけめ, denotes an opening formed when rock, cloth, a sack, or similar material splits or tears.
• Basic usage: It names a fissure in rock and a tear in a sack through which rice spills.

2. Common pitfalls and similar expressions

• An opening caused by splitting or tearing
  • It is an opening produced by splitting or tearing material, not a hole intentionally made from the start.