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Definitions

lock

[lok] / lɒk /
NOUN
device that fastens and bars free passage
Synonyms
STRONGEST
bolt grip latch
STRONG
bar bond catch clamp clasp clinch connection fastening fixture grapple hasp hook junction link padlock
Antonyms
STRONGEST
key
VERB
fasten, clasp
Synonyms
STRONGEST
close engage join press seal shut
STRONG
bar bolt button clench clutch embrace encircle enclose entwine grapple grasp hug latch link mesh secure unite
WEAK
button up turn the key
Antonyms
STRONGEST
disjoin open release unseal
STRONG
divide let go loose loosen separate unfasten unlock unloose
WEAK
unclasp

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Spot prices for real-world shipments of crude remained far more elevated, signaling a rush by refiners to lock in supplies.

From The Wall Street Journal • Apr. 9, 2026

When he stepped inside the ropes on Thursday, McIlroy was finally able to lock in and stoke the competitive fire which has fuelled his outstanding career.

From BBC • Apr. 9, 2026

This spending reflects signed interconnection agreements, contracted load commitments and regulatory filings that lock in returns.

From MarketWatch • Apr. 8, 2026

Don eventually remarried and had three more kids, but he held on to a big box of Cynthia’s clothes and other keepsakes, including a lock of hair and bottle of her perfume.

From Slate • Apr. 6, 2026

“I wanted to change, but somebody was in an all fire hurry to look at the new recruits,” Serina said, pushing a dripping blond lock of hair out of her eyes to glare at Sam.

From "Glitch" by Laura Martin

Vocabulary lists containing lock

Chapter 11: Growth and Expansion

Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!