a hand tool for cutting wood or other hard materials, typically with a long, thin serrated blade and operated using a backwards and forwards movement

cut (something) using a saw

the top of each post is sawn off at railing height

thieves escaped after sawing through iron bars on a window

make rapid to-and-fro motions in cutting something or in playing a stringed instrument

he was sawing away energetically at the loaf

a proverb or maxim

as the old saw goes, there is nothing new under the sun