a rough or unfinished drawing or painting, often made to assist in making a more finished picture

a charcoal sketch

a short humorous play or performance, consisting typically of one scene in a revue or comedy programme

a hilarious sketch for their latest BBC series

a comical or amusing person or thing

make a rough drawing of

as they talked, Modigliani began to sketch her

Jeanne sketched and painted whenever she had the time