to be so worried or upset that you don't know what to do
быть так обеспокоенным или расстроенным, что не знаешь, что делать
"I'm at my wits' end trying to calm the kids down."
"Я на грани нервного срыва, пытаясь успокоить детей."
to do what one has promised
to finish something before the deadline
to keep a feeling of thankfulness towards someone
the most advanced or innovative part of something
to trust your own abilities and decisions
to become so excited that you lose control of your feelings...
