thief

to steal techniques; to learn secretly from sb else's skills or methods

stealthily

stealthily

to photograph or film sb without their knowledge or consent

to escape, to run off

to steal

to mount a sneak attack

to carry on a clandestine love affair

to laugh up one's sleeve

illegal immigration

(verb) to steal a chicken; (slang) to sneak out in order to do less work; to slack off; to not play by the rules

to be lazy when effort is expected; to slack off

to make a false start; to jump the gun

to eavesdrop

to peep

to have an affair; literally "stealing food"

to make thinner

to snatch a moment of leisure

to get a boner; to have an erection [colloquial]

to peek

to steal something

to cheat on one's spouse

to sneak off; to slip away