bubble bath
US /ˈbʌb.əl ˌbæθ/
UK /ˈbʌb.əl ˌbæθ/

1.
a preparation that produces bubbles in bathwater
:
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She poured a generous amount of bubble bath into the tub.
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The children love playing with the foam from the bubble bath.
2.
a bath with bubbles in the water
:
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After a long day, a warm bubble bath is very relaxing.
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She decided to treat herself to a luxurious bubble bath.