Can you use a Bonus Action on a turn other than your own?

The rules for Bonus Actions (PHB, pg.189) state;

You can take only one bonus action on your turn…

Which to me can be read in two ways.

  1. You can only take a bonus action if it is your turn.
  2. You can take only one bonus action on your turn but can take one or more on someone else’s turn.

As an example, if I were to ready an attack action could I also use a bonus action for Two-Weapon Fighting when the trigger is met?