ツーロック

noun

two locks; double locking (bicycle)

Refers to using two separate locks on a bicycle for extra security, a common anti-theft practice in Japan.

• 自じ転てん車しゃを駐ちゅう輪りんするときはツーロックを心こころがけましょう。

  When parking your bicycle, make sure to use two locks.

noun

double lock; two-point locking (door)

A door lock that engages at two points, often a deadbolt plus a latch, for improved security.

• この玄げん関かんドアはツーロックになっているので安あん心しんです。

  This front door has a double lock, so it's reassuring.