Definition of bubble verb from the Oxford Advanced American Dictionary

     

    bubble

     verb
    verb
    NAmE//ˈbʌbl//
     
    Verb Forms present simple I / you / we / they bubble
     
    he / she / it bubbles
     
    past simple bubbled
     
    -ing form bubbling
     
     
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  1. 1[intransitive] to form bubbles The water in the pan was beginning to bubble. Add the white wine and let it bubble up. Cook until the cheese is golden and bubbling.
  2. 2[intransitive] (+ adv./prep.) to make a bubbling sound, especially when moving in the direction mentioned I could hear the soup bubbling away. A stream came bubbling between the stones. Mike's laugh bubbled down the line.
  3. 3[intransitive] bubble (over) with something to be full of a particular feeling She was bubbling over with excitement.
  4. 4 [intransitive] + adv./prep. (of a feeling) to be felt strongly by a person; to be present in a situation Laughter bubbled up inside him. the anger that bubbled beneath the surface Long-standing ethnic tensions have bubbled to the surface. Game-rigging is still bubbling away in the background.
  5. Idioms
    bubble under the radar(informal)
     
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    to be likely to be very successful or popular soon Here are two records that are bubbling under the radar.
See the Oxford Advanced Learner's Dictionary entry: bubble