Cool MateFasten vs Lock
When to use each in English, with meaning, register, and examples.
Fasten
Top 3,000 (common)B1verb
Lock
Top 1,000 (very common)A2verb
Most common: Lock
| Fasten | Lock | |
|---|---|---|
| Pronunciation | 🇬🇧 /["/ˈfɑːsn/","/ˈfɑːsnz/","/ˈfɑːsnd/","/ˈfɑːsnɪŋ/"]/🇺🇸 /["/ˈfæsn/","/ˈfæsnz/","/ˈfæsnd/","/ˈfæsnɪŋ/"]/ | 🇬🇧 /["/lɒk/","/lɒks/","/lɒkt/","/ˈlɒkɪŋ/"]/🇺🇸 /["/lɑːk/","/lɑːks/","/lɑːkt/","/ˈlɑːkɪŋ/"]/ |
| Meaning | To make something secure or tight. | A device that keeps things secure and needs a key or combination to open. |
| Example | Please fasten your seatbelt before the flight. | Please make sure to lock the door before you leave. |
| Register | Neutral | Neutral |
| How common | Top 3,000 (common) | Top 1,000 (very common) |
| CEFR level | B1 | A2 |
| Part of speech | verb | verb |
| Collocations | firmly, properly, securely, to, firmly, properly, securely, to, firmly, properly, securely, to, firmly, properly, securely, to | carefully, automatically, electronically, forget to, be firmly locked, be securely locked, keep something locked, away, in, in, be safely locked, be securely locked |
| Antonyms | loosen, unfasten | unlock, open |
| Common mistakes | Confusing 'fasten' with 'loosen'., Using 'fasten' without an object, e.g., saying 'I need to fasten.' instead of 'I need to fasten my seatbelt.', Mixing up 'fasten' with other similar verbs like 'attach' or 'secure'. | Confused with 'unlock', not realizing they are opposites., Using 'lock' as a noun instead of a verb incorrectly., Mispronouncing 'lock' as 'luck'. |
| Usage notes | Use 'fasten' when you want to describe securing something, like a seatbelt or a button. It's appropriate in most contexts. | Use 'lock' when talking about securing something, like a door or a bike. Avoid using it in very casual conversations where simpler terms like 'close' may be more appropriate. |
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Frequently asked questions: Fasten vs Lock
What's the difference between Fasten and Lock?
Fasten: To make something secure or tight. Lock: A device that keeps things secure and needs a key or combination to open.
Which is more common: Fasten and Lock?
Lock is the most common in everyday English.
Which is more advanced: Fasten and Lock?
Fasten is the highest level, at B1, on the CEFR scale.
Are Fasten and Lock the same CEFR level?
Fasten: B1, Lock: A2 on the CEFR scale.
What part of speech are Fasten and Lock?
Fasten: verb, Lock: verb.
Can you show an example of each?
Fasten: Please fasten your seatbelt before the flight. Lock: Please make sure to lock the door before you leave.
Can I use Fasten and Lock interchangeably?
Not always. Fasten and Lock are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.