lock on

1. (intransitive)To begin tracking a target via an automated system.

2. (transitive)To cause a missile to track (a target).

3. (intransitive)To engage in a lock-on protest.

1. There's no lock on the door.

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2. I changed the lock on my door.

   ruЯ сменил замок на своей двери. — Balamax

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3. Please lock the door on your way out.

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4. Tom suggested that I change the lock on my door.

   deTom legte mir nahe, das Türschloss auszuwechseln. — brauchinet

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5. I need put a new lock on the front door.

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irregular

• lock upповісити, вішатиTo imprison or incarcerate (someone).
• lock inприбрати, прибиратиUsed other than figuratively or idiomatically: To secure (someone or something) in a locked enclosure.
• lock awayприбрати, прибиратиTo lock up; to lock in a safe place, out of view.
• lock offTo stop talking to (someone); to cut (someone) out; to ghost (someone).
• lock outTo inadvertently prevent (a person, particularly oneself) from entering a place, by leaving it locked.
• lock onTo begin tracking a target via an automated system.
• lock downTo secure (something).
• lock intoTo firmly commit to (something or someone).