to think very hard about something
pensar muy duro sobre algo (pensar muy duro sobre algo)
"I had to rack my brains to remember her name."
"Tuve que rack my brains para recordar su nombre." (Tuve que **rack my brains** para recordar su nombre.)
to do what one has promised to do
to enjoy yourself by dancing or celebrating
to state rules firmly and clearly
To quickly become good friends and enjoy each other’s compan...
to frighten someone very much
to find a problem or defect in a system