at the peak of activity or progress
au sommet de l'activité ou des progrès (au sommet de l'activité ou des progrès)
"The dance rehearsal is in full swing before the big day."
"La répétition de danse est en plein essor avant le grand jour." (la répétition de danse est en plein essor avant le grand jour)
to be treated in the same unpleasant way that you have treat...
to aim for something very ambitious or difficult to achieve
to forget something accidentally
used to give a brief and clear summary
to dismiss something as unimportant or not worth considering
unfortunate or unlucky situation