From Longman Dictionary of Contemporary Englishtime of the monthtime of the monththe time when a woman has her period It’s that time of the month. → time
Examples from the Corpus
time of the month• This is a safe time of the month for me.• Even the time of the month can not be blamed for women's tendency to depression.• Surely not the time of the month?• She was worrying that they'd made love at the wrong time of the month. 