Literally "blow of mercy", this French phrase is used for any decisive stroke
[DOC] [TLE] grace definition | English definition dictionary | Reverso [PAR] 1 elegance and beauty of movement, form, expression, or proportion ... coup de 
grce (French) ... 2 a final or decisive stroke (literally: blow of mercy) ... n 
preceded by: your, his, or her a title used to address or refer to a duke, duchess, 
... n any year of the Christian era, as dated from the presumed date of Christ's 
birth.