full breasts; ample breasts
A descriptive noun for full or ample breasts. Compared with the cosmetic-procedure meaning, this standalone descriptive sense can sound formal, literary, or dictionary-like.
She underwent breast augmentation surgery last year.
In the work, the goddess is depicted as a full-breasted beauty.
breast enlargement; breast augmentation
Usually refers to enlarging the breasts cosmetically, especially in phrases such as 豊胸手術. This is the most practical modern use for learners to recognize.
See also: 豊胸手術
Before undergoing breast augmentation surgery, she received an explanation of the risks from the doctor.
If you are considering breast enlargement, you should consult a specialist.
That clinic performs breast enlargement using the latest techniques.
バストアップ is a casual beauty/marketing term for making the bust look larger, whereas 豊胸 more strongly implies surgical enlargement or a formal description of fullness.
豊満 describes a fuller, voluptuous body or figure in general, while 豊胸 specifically describes or refers to the breasts.
A Sino-Japanese compound of 豊, associated with abundance or fullness, and 胸, chest or breast. The spelling transparently matches both the descriptive sense and the later cosmetic-enlargement sense.