It means that it is very hard to change someones habits
You can't teach an old dog new tricks when they have been used to using a cell phone instead of a smart phone.
by Zahraa June 13, 2017
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The full title of one of the most annoying Chips Challenge levels ever, featured in CCLP3.
Crap, You Can't Teach An Old Frog New Tricks is so damn hard!
by mypseudoonym... January 20, 2012
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When you can’t get what you’re working with up to the required standard
Jeff: “That bloke just isn’t cut out for the job”
Tim: “yeah mate, you can’t teach a Duck how to fly like an Eagle
by killacrip August 12, 2021
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teach a man to fish saying

something someone named leo can’t stop saying
the teach a man to fish saying is said like this, “If you give a man a fish, you feed him for a day. If you teach a man to fish, you feed him for a lifetime.” - john leo penn
by bskakanwkjsbsjsj August 10, 2022
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To mercy kill someone(usually a loved one) much like how lennie was killed by george in the book Of Mice and Men.
Friend: omg, your sister turned into a zombie!

Me: time to teach lennie about the rabbits
by ticklish-ear August 16, 2022
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Teaching Latin

Verb (present tense) To make something up as you go along.
No latin teacher has ever heard actual latin spoken. So in to a degree they are making up how it sounds.
Mike what do you know about sailing, how are you going to going to win the regatta? “I’m going to have to really be teaching latin if I want to win”

“The state shut down my restaurant because of Covid-19 I’m going to have to be teaching latin to make rent.”
by Chicagoguy69 May 15, 2020
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