British saying which means to inform the authorities about someone's misdeeds

to tell on/tell over/rat out some-one

Short vegetation that grows over large areas, usually green. Grass may vary in lenth, texture, width, and color. Most areas in front of a home are covered with grass.

a snitch, some one who tells to police/orthorities on someones dodgey acts.

weed... stuff u smoke to get high

Informant, snitch. Someone who sell out others.