From the verb bubble: (⇒ conjugate)
bubbling is: Click the infinitive to see all available inflections
v pres pverb, present participle: -ing verb used descriptively or to form progressive verb--for example, "a singing bird," "It is singing."

WordReference Random House Learner's Dictionary of American English © 2020
bub•ble /ˈbʌbəl/USA pronunciation   n., v.,  -bled, -bling. 
n. [countable]
  1. Physicsa round body of gas in a liquid:The bubbles rose to the top of the kettle as the water boiled.
  2. anything that seems to be solid but is not;
    a delusion or false hope:One day her bubble burst.
  3. a canopy, shelter, or structure in the shape of a ball;
    dome:The huge bubble enclosed the stadium.

v. [no object]
  1. to form, produce, or release bubbles:The boiling water was bubbling.
  2. to flow or spout with a gurgling noise:A fountain bubbled in the hotel lobby.
  3. to proceed or go along in a lively, sparkling manner: The play bubbled with fun.
  4. bubble over, [no object] to overflow with liveliness or happiness:bubbling over with joy at the prospect of moving to a new house.

WordReference Random House Unabridged Dictionary of American English © 2020
bub•ble  (bubəl),USA pronunciation n., v.,  -bled, -bling. 
  1. Physicsa nearly spherical body of gas contained in a liquid.
  2. Physicsa small globule of gas in a thin liquid envelope.
  3. Physicsa globule of air or gas, or a globular vacuum, contained in a solid.
  4. anything that lacks firmness, substance, or permanence;
    an illusion or delusion.
  5. an inflated speculation, esp. if fraudulent:The real-estate bubble ruined many investors.
  6. the act or sound of bubbling.
  7. a spherical or nearly spherical canopy or shelter;
    dome:The bombing plane bristled with machine-gun bubbles. A network of radar bubbles stretches across northern Canada.
  8. a domelike structure, usually of inflated plastic, used to enclose a swimming pool, tennis court, etc.
  9. Informal Termsa protected, exempt, or unique area, industry, etc.:The oasis is a bubble of green in the middle of the desert.
  10. an area that can be defended, protected, patrolled, etc., or that comes under one's jurisdiction:The carrier fleet's bubble includes the Hawaiian Islands.
  11. a sudden, small, temporary change or divergence from a trend:In May there was a bubble in car sales, with three percent more being sold than last year.

  1. to form, produce, or release bubbles;
  2. to flow or spout with a gurgling noise;
  3. to boil:The tea bubbled in the pot.
  4. to speak, move, issue forth, or exist in a lively, sparkling manner;
    exude cheer:The play bubbled with songs and dances.
  5. to seethe or stir, as with excitement:His mind bubbles with plans and schemes.

  1. to cause to bubble;
    make bubbles in.
  2. [Archaic.]to cheat;
  3. bubble over, to become lively:The last time I saw her she was bubbling over with enthusiasm.
bubble•less, adj. 
bubble•like′, adj. 
bubbling•ly, adv. 
  • 1350–1400; Middle English bobel (noun, nominal); cognate with Middle Dutch bobbel, Middle Low German bubbele, Swedish bubbla

Collins Concise English Dictionary © HarperCollins Publishers::
bubble /ˈbʌbəl/ n
  1. a thin film of liquid forming a hollow globule around air or a gas: a soap bubble
  2. a small globule of air or a gas in a liquid or a solid, as in carbonated drinks, glass, etc
  3. the sound made by a bubbling liquid
  4. something lacking substance, stability, or seriousness
  5. an unreliable scheme or enterprise
  6. a dome, esp a transparent glass or plastic one
  1. to form or cause to form bubbles
  2. (intransitive) to move or flow with a gurgling sound
  3. (intransitive) ; often followed by over: to overflow (with excitement, anger, etc)
Etymology: 14th Century: probably of Scandinavian origin; compare Swedish bubbla, Danish boble, Dutch bobbel, all of imitative origin
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