English Reference

Word

lessen

US/ˈɫɛsən/

UK/lˈɛsən/

Definitions

01to reduce something

B2 · Upper Intermediate

v. to make something smaller, weaker, or less in amount.

v. to cause something to decrease in size, extent, amount, or degree. Transitive — takes a direct object.

“The new medicine helped to lessen the pain in his back.”

“The government introduced several tax breaks intended to lessen the financial burden on small business owners during the recession.”

02to become less

B2 · Upper Intermediate

v. to become smaller or weaker.

v. to become less in size, degree, or intensity. Intransitive — used without a direct object.

“As the storm moved away, the sound of the wind began to lessen.”

“The risk of infection will lessen significantly once the patient completes the full course of antibiotics.”

Synonyms

Antonyms

Usage

Can be used both transitively (to lessen something) and intransitively (something lessens).

Real-World Examples

“There’s nothing that can lessen my pride and love for everything we’ve been through.”
The Guardian 7 Oct 2026
“By the 90s, it was recognised that the symptoms did not always disappear completely but did lessen as people got older.”
The Guardian 1 Mar 2025
“Adding electric vans and putting limits on tourist buses would also help lessen the public health risk, she said.”
BBC 8 Dec 2014

Etymology

From Middle English lessenen, lasnen, equivalent to less + -en (verbal suffix).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry

Exam level
CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.B2 FirstIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.5.5–6.5TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 4.0–4.572–94TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.785–944
Frequency
Frequent
Level
B2 · Upper Intermediate
Updated

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