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In some senses, grandmammy is marked as informal. Watch for register when choosing this word.
ADJ.
all
VERB + GRANDMAMMY
see
GRANDMAMMY + NOUN
blues-singers, understatements
noun
Grandmother.
Synonym of granddaddy (“something that is the greatest or most significant of its kind”).
[…] and his orchestra as enchanting to dance to as it is, even if all this wasn't so superb, you'd want to go just to hear and see that grandmammy of all blues-singers who can still out-blue all of the younger ones, none other than Sophie Tucker.
[…] that these administration signals took us students by surprise would be the grandmammy of all understatements. Folks were, depending on their inclinations, in turn suspicious, flattered, surprised, confused, or all of the above simultaneously […]
[…] and his orchestra as enchanting to dance to as it is, even if all this wasn't so superb, you'd want to go just to hear and see that grandmammy of all blues-singers who can still out-blue all of th
Wiktionary[…] that these administration signals took us students by surprise would be the grandmammy of all understatements. Folks were, depending on their inclinations, in turn suspicious, flattered, surprised
Wiktionaryi Register
In some senses, grandmammy is marked as informal. Watch for register when choosing this word.