탈선

derailment

Explanation

〔脫線〕

[탈썬]

1. derailment
An act of the wheels of a train, streetcar, etc., jumping the rails.

2. deviation; going astray
The state of one’s word, behavior, etc., turning to a bad direction.

3. divergence; digression
An act of starting to do something else, instead of seeking one’s own goal.