“A month of Sunday” means a long time. It can refer to a literal month full of Sundays, religious and cultural connotations, or an event that is unlikely to happen.
The simplest definition of the idiom “a month of Sunday” is “a very long time”, although like many sayings, it is possible to dissect this expression and find more literal meanings and cultural origins. For example, a person might refer to the literal idea of a month full of Sundays, which would refer to the time it takes for 30 or 31 Sundays to pass. He might use the saying to refer, directly or indirectly, to the religious and cultural connotations of having a month filled with Sundays or a period of time of limited or unexciting activity. Some people use the saying when referring to an event that is impossible or unlikely to happen, just as a month will never be filled with just Sundays. However, while it may not be universal, this idiom is widely accepted by many English-speaking cultures as meaning that a particular event or period of time is extremely long.
Taking the idiom “a month of Sundays” in its most literal sense, it describes a period of time that is longer than a month. For example, most months have 30 or 31 days, and during those months Sundays come every seven days. So, to think of a month full of Sundays is to think of 30 or 31 Sundays that come every seven days. This would take 30 weeks, or about seven and a half months. In this sense, one friend might complain to another that she hasn’t seen her in a month on Sundays, which means that the two have not seen each other for a long time.
When referring to the religious or cultural aspects associated with Sunday, someone who says an event or period of time lasted for a month on a Sunday might be referring to the mood of that time. For example, people of various religions and cultural beliefs have long designated Sunday as a day of worship and rest, and some cultures forbid people from engaging in any type of entertainment on Sunday. That inactivity can lead to boredom or tiredness, feelings that can make the time seem longer than it is. So, having a month full of Sundays can mean having 30 or 31 extra long and possibly boring days.
Since a month of Sunday is impossible, some use the saying to describe an event that will never happen. Maybe a football coach says his third-string quarterback will earn an athletic scholarship in a month on a Sunday. When used in such situations, the saying usually means that the event will not occur.
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