The term 'Like Jack' can be summarized by the crossword solution 'NIMBLE, ' which is a six-letter word. NIMBLE means to be quick and light in movement or action, and is often used to describe someone who is agile and able to move quickly. This term is often associated with the character of Jack from the fairy tale 'Jack and the Beanstalk, ' who was known for his agility and ability to climb the beanstalk quickly.