night latch
C1/C2Neutral to slightly formal, common in property, security, and hardware contexts.
Definition
Meaning
A lock on a door, typically operable from the outside only with a key and from the inside with a handle, designed to automatically lock when the door is closed.
A simple deadlocking latch for a door, often a supplementary security lock used in addition to the main lock. Historically, a type of lock providing security at night while allowing exit from within without a key.
Linguistics
Semantic Notes
Specifically refers to a lock mechanism, not a door bolt or chain. The 'night' component historically indicated its use for security when occupants were inside.
Dialectal Variation
British vs American Usage
Differences
Term is standard and widely understood in both varieties, but possibly more common in British English. American English might use 'deadlatch', 'nightlatch', or just 'latch lock' more frequently.
Connotations
In both varieties, it carries connotations of basic home security. In British contexts, it may be associated with traditional sash windows and older door types.
Frequency
Moderately low frequency in general discourse but standard in specific domains like locksmithing, hardware, and property descriptions.
Vocabulary
Collocations
Grammar
Valency Patterns
[Subject] + fit + [Object: night latch] + [Prepositional: to/on the door][Subject] + lock/unlock + [Object: the night latch]Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Used in property listings, security system descriptions, and home insurance assessments.
Academic
Rare; potentially in historical studies of domestic architecture or security technology.
Everyday
Used when discussing home security, broken locks, or giving instructions to visitors (e.g., 'Just pull the door to; the night latch will lock it').
Technical
Standard term in locksmithing, hardware manufacturing, and building regulations.
Examples
By Part of Speech
verb
British English
- Please ensure you night-latch the door when you leave.
adjective
British English
- It's a night-latch mechanism.
- We need a night-latch key.
Examples
By CEFR Level
- The door has a night latch, so it locks automatically.
- Before going to bed, she checked that the night latch was engaged.
- The property survey noted that the original Victorian night latch, while decorative, did not meet modern insurance security standards.
Learning
Memory Aids
Mnemonic
Think: At NIGHT, you LATCH the door for security. It's a NIGHT LATCH.
Conceptual Metaphor
SECURITY IS A BARRIER; AUTOMATIC PROTECTION IS A SELF-ACTING GUARD.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid direct calque 'ночная защелка'. The standard Russian equivalent is 'запорный замок' or specifically 'ночная задвижка' in some contexts.
- Do not confuse with 'deadbolt' ('ригельный замок').
Common Mistakes
- Spelling as one word 'nightlatch' (acceptable variant) or 'night-latch' (hyphenated).
- Confusing it with a 'deadbolt', which typically requires a key to lock from both sides.
- Using it to refer to a door chain or a simple sliding bolt.
Practice
Quiz
What is the primary function of a night latch?
FAQ
Frequently Asked Questions
No. A night latch is a type of dead*LATCH* that locks automatically. A dead*LOCK* usually requires a key to lock from both sides and does not have a spring-loaded latch.
Typically, no. A standard night latch is locked from the outside and requires a key. From the inside, it is usually opened with a handle or turn knob.
Both 'night latch' (two words) and 'nightlatch' (one word) are considered correct, though 'night latch' is more common in formal writing.
Modern security advice often recommends a night latch as a supplementary lock, not the primary one, as it can sometimes be vulnerable to techniques like 'loiding' (slipping the latch with a thin card).