Definition of hit it off in US English:

hit it off

phrase

informal
  • Be naturally friendly or well suited.

    • ‘He was glad his friends were hitting it off with Kelly, especially since the start of her day had been kinda rough.’
    • ‘The two of them hit it off wonderfully and it was the start of a great friendship.’
    • ‘It wasn't long before all six of us hit it off, teasing and conversing like old friends.’
    • ‘If they hit it off, she'll be able to pass along a positive word to your other pals.’
    • ‘It so happened that they hit it off immediately and became best friends off the court.’
    • ‘Carrie's friend Cathey had introduced the two and they seemed to hit it off immediately.’
    • ‘Ideally, they'll hit it off, become buds, and you'll never have to worry about it again.’
    • ‘So they decided to bombard me with personal questions about my best friend, and we hit it off at once.’
    • ‘We weren't really hitting it off, but Figi still decides to put her arm around my waist and squeeze me.’
    • ‘She met this guy Tim at a party of a mutual friend and seemed to hit it off.’
    get on well, get on, get along, be on good terms, be friends, be friendly, be compatible, relate well to each other, feel a rapport, see eye to eye, take to each other, warm to each other, find things in common
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