"Be in bloom" refers to a stage where a flower has fully blossomed and is displaying its vibrant, colourful petals. There are numerous synonyms for this phrase, including "blossom," "flowering," "blooming," and "flourishing." Each of these words refers to the same process of a flower displaying its beauty and vibrancy. Other synonymous phrases include "bursting into flower," "coming into bloom," and "sprouting up in full bloom." The common thread among each of these phrases is their emphasis on the beauty and vitality of nature, and the joy that comes with observing and experiencing it.