Kalah means to complete, finish, be at an end, consume, or destroy. It appears about 205 times. It can be positive (completing a task) or negative (destroying). The idea of bringing something to its full end drives both meanings.
When God completes His work, it is perfect — creation, the tabernacle, His purposes. In judgment, kalah means total destruction. Yet even in judgment, God promises not to make a 'full end' of His people (Jeremiah 4:27), showing restraint within sovereignty.