Meaning

• A narrow opening such as a fissure or crack.

• A chip or dent in something metallic.

  "The warrior saw a chink in her enemy's armor, and aimed her spear accordingly."

• A vulnerability or flaw in a protection system or in any otherwise formidable system.

  "The chink in the theory is that the invaders have superior muskets."

Meaning

• To fill an opening such as the space between logs in a log house with chinking; to caulk.

  "to chink a wall"

• To crack; to open.

• To cause to open in cracks or fissures.