下个月
xià gè yuè
next month
next (下) + measure (个) + moon (月) = next month
月 originally depicted a crescent moon, and the same character does double duty for both moon and month. 下 places you one unit below the current position on a timeline, so 下个月 is literally the month just beneath where you stand.
下个月我要去看医生。
xià gè yuè wǒ yào qù kàn yī shēng。
Next month I am going to see a doctor.
她说下个月会搬到新家住。
tā shuō xià gè yuè huì bān dào xīn jiā zhù。
She said she will move into her new home next month.