The idea of training lazily is a very un-Klingon notion, but there's a slang expression that's heard occasionally based on the verb tab "wane, ebb, dwindle." This is a word that can be used when talking about phases of a moon, for example, but it's not used to refer to living things (people, animals, plants) except idiomatically: To say to someone bItab, literally "you wane," is to say "you are not applying yourself fully to the task at hand." (It would be extremely unlikely to hear a Klingon say jItab "I wane" or matab "we wane.")

The opposite of "wane," that is, "wax," is usually just tabHa'. It's not unheard of to say bItabHa' to a lazy worker or trainee who's finally up to speed, but it's not common. bItabHa' would never be addressed to someone who's been training or practicing or working diligently all along.

(qepHom 2020)