sneak >> sniːk
Definition: [verb] move or go in a furtive or stealthy way.
Example: I sneaked out by the back exit
Definition: [verb] (especially in children's use) inform an adult or person in authority of a companion's misdeeds; tell tales.
Example: she sneaked on us
Definition: [noun] (especially in children's use) someone who informs an adult or person in authority of a companion's misdeeds; a telltale.
Example: Ethel was the form sneak and goody-goody
Definition: [noun] short for sneaker.
Definition: [adjective] acting or done surreptitiously, unofficially, or without warning.
Example: a sneak thief