Suthak is a gujarati word for the 16day period when a deceased persons family members cannot perform or attend any religious or wedding ceremonies. They also cannot visit new born babies. This 16day period starts from the day the deceased passed away.
There is no widely known or documented definition or meaning for the word "suthak." It is possible that it may be a term specific to a particular language, culture, or context. If more information or context is provided, I may be able to offer a more accurate explanation.