The Vietnamese word "sáng trăng" refers to the brightness or clarity of the moonlight, particularly on a clear night. It can be used to describe the beauty of a moonlit night or the soft illumination provided by the moon.
In more advanced contexts, "sáng trăng" can be used metaphorically to describe clarity or enlightenment in thoughts or emotions. For example, it could signify a moment of realization or understanding, much like how the moonlight illuminates the darkness.
While "sáng trăng" generally refers to moonlight, in certain contexts, it can also imply a sense of nostalgia or longing when reminiscing about past moments spent under the moonlight.