swear

1 of 2

verb

ˈswer 

swore ˈswȯr  ; sworn ˈswȯrn  ; swearing

transitive verb

1

: to utter or take solemnly (an oath)

2

a

: to assert as true or promise under oath

a sworn affidavit

swore to uphold the Constitution

b

: to assert or promise emphatically or earnestly

swore he'd study harder next time

3

a

: to put to an oath : administer an oath to

b

: to bind by an oath

swore them to secrecy

4

obsolete : to invoke the name of (a sacred being) in an oath

5

: to bring into a specified state by swearing

swore his life away

intransitive verb

1

: to take an oath

2

: to use profane or obscene language : curse

swearer noun

swear

2 of 2

noun

: oath, swear word

Phrases

swear by

: to place great confidence in

swears by his mechanic

swear for

: to give assurance for : guarantee

swear off

: to vow to abstain from : renounce

swear off smoking

Synonyms

Verb

• curse
• cuss
• blaspheme
• damn

Noun

• curse
• cuss

Examples of swear in a Sentence

Verb

He swore revenge on the killers.

I swear to God, I'll kill him if he comes back.

Don't swear in front of the children.

I do solemnly swear to tell the whole truth.

Noun

I heard him say a swear.

can't you express your frustration without using swears?

Recent Examples on the Web

Verb

Some parents even swear by certain hacks for relieving ear pain during air travel. —Sherri Gordon, Parents, 23 Oct. 2025

This is why so many great writers swear by deliberately messy first passes. —Big Think, 23 Oct. 2025

Noun

Visitors of years past swear by their trick-or-treating hauls from these affluent neighborhoods, specifically the homes of Marissa Meyer (Professorville), Mark Zuckerberg (Crescent Park) and Larry Page and Laurene Powell Jobs (Old Palo Alto). —John Metcalfe, Mercury News, 21 Oct. 2025

Does Taylor Swift swear on 'The Life of a Showgirl'? —Melina Khan, USA Today, 3 Oct. 2025

Word History

Etymology

Verb

Middle English sweren, from Old English swerian; akin to Old High German swerien to swear and perhaps to Old Church Slavic svarŭ quarrel

First Known Use

Verb

before the 12th century, in the meaning defined at transitive sense 1

Noun

14th century, in the meaning defined above

Phrases Containing swear

• I swear
• not swear to it
• swear blind
• swear in
• swear on one's mother's grave
• swear on the Bible
• swear out
• swear (someone) to secrecy
• swear (someone) to silence
• swear to secrecy
• swear up and down
• swear word
• you would swear

Rhymes for swear

• air
• ayre
• bahr
• bare
• blare
• care
• chair
• claire
• ere
• err
• eyre
• fair

Kids Definition

swear

verb

ˈswa(ə)r,

ˈswe(ə)r

swore

ˈswō(ə)r,

ˈswȯ(ə)r

; sworn

ˈswō(ə)rn,

ˈswȯ(ə)rn

; swearing

1

: to make a statement or promise under oath

2

a

: to state as true under oath

a sworn statement

b

: to state or promise strongly or sincerely

I swear that I was there

3

a

: to give an oath to

the witness was sworn

b

: to bind by an oath

swore us to secrecy

4

: to take an oath

5

: to use bad or vulgar language

swearer noun

Legal Definition

swear

verb

swore; sworn; swearing

transitive verb

1

: to utter or take solemnly

swear an oath

2

a

: to assert as true or promise under oath

a sworn affidavit

b

: to assert or promise emphatically or earnestly

swore to uphold the constitution

3

a

: to put to an oath

b

: to bind by an oath

intransitive verb

: to take an oath

Etymology

Verb

Old English swerian