Definition of swear by in US English:

swear by

phrasal verb

informal
  • Have or express great confidence in the use, value, or effectiveness of.

    ‘Iris swears by her yoga’
    • ‘And according to those who swear by its effects, unlike gymnastics, you don't have to do somersaults in this event.’
    • ‘Long before call centres adopted the ‘Customer is king’ policy, hotel management personnel swore by it.’
    • ‘Dhupia swears by the on-screen chemistry of the two actors.’
    • ‘The farmer owns six cows and swears by a herbal potion made from tree bark and salt, handed down from generation to generation here.’
    • ‘Apparently my aunt swore by it with my cousin and told mum who told nan who told my other aunt and it was the whole family's solution whilst we were babies.’
    • ‘Wilson swears by the importance and value of a good oil analysis program.’
    • ‘Now, please place your right hand on your chests and swear by whatever you believe in.’
    • ‘For every sprightly old lady who swears by non-smoking, teetotal spinsterhood, there's another who boozed the evenings away with each of her seven husbands after a hard day's work in the tobacco-testing factory.’
    • ‘I have friends who also swear by Iyengar yoga, which is a variant of Hatha (as is Ashtanga).’
    • ‘I enjoy and take life as it comes,’ says Aditi, who swears by vegetarianism and is into yoga.’
    • ‘But Dr Phillip Anthony McMillan, a UK-trained doctor, who specialises in Botox treatment, swears by this drug for the treatment of wrinkles and a number of neurological conditions.’
    • ‘Although there are definite pros and cons, particularly regarding the safety of riding with strangers, everyone who swears by hitch-hiking will agree on one point: it guarantees an adventure.’
    • ‘Whether in the tenements of Mumbai or in the villages around Ayodhya, I found Hindus and Muslims who lived and ate together and swore by each other even in times of crisis.’
    • ‘Are there doctors who swear by values that made medicine a profession quite different from others?’
    • ‘The 24-year-old once swore by the smart boutiques of Princes Square, one of Glasgow's premier league shopping destinations.’
    • ‘J.P. Krishna of Chennai has been painting hoardings for films and political meetings for 15 years now and still swears by the gada cloth and his art.’
    • ‘The troupe swears by novelty and is a big crowd puller.’
    • ‘The family swears by Shiv Dharma, the new religion which is expected to give an impetus to the ‘Brahminetar’ (non-Brahmin) movement in Maharashtra.’
    • ‘A guard swore by his honor, his faith and his love for his children that no one would be executed.’
    • ‘In a country where women swore by their gold, a shift in taste and preference is seen.’
    express confidence in, have faith in, put one's faith in, trust, have every confidence in, believe in
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