To say "big sister" in French, you would say "grande sœur."
Big is translated 'grand, grande' in French.
grand groupe is how you say big group in French.
Very big is said: très grand in french.
A big bell is 'une grosse cloche' in French
a big table is translated 'une grande table' in French
A big dog would be "un grand chien" in French.
Big breasts are 'des gros seins' (familiar/slangish) in French.
c'est grand
big- grande elegant- elegante
je suis callipyge
grande jour