two children in a nursery rhyme (=an old song or poem for young children.) The rhyme goes: Jack and Jill went up the hill/To fetch a pail of water;/Jack fell down and broke his crown,/And Jill came tumbling after.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
Dictionary pictures of the day
Do you know what each of these is called?
Click on any of the pictures above to find out what it is called.