Think Twice Meaning

(idiomatic) To reconsider, use judgement; to proceed with caution or thought.

Example:   Think twice before you go, since it could be dangerous.
1962, Bob Dylan, Don't Think Twice, It's All Right
  When your rooster crows at the break o' dawn
  Look out your windo' and I'll be gone
  You're the reason I'm a travelin' on
  But don't think twice, it's all right.