Stick it out

[Cayte]

A literal meaning vs idiomatic meaning:

Frank: What's Ernie's doing?
Friend: He bit his tongue but couldn't get a doctor's appointment today. They told him he'd just have to stick it out until tomorrow.

stick it out - (literal meaning) to put something so that part or all of it outside something else, in this case, the tongue is outside his mouth.
               - (idiomatic meaning) to continue doing something until the end, in this case, to continue to cope with the problem until the doctor can see him the next day.
               So Ernie is thinking of the literal meaning, but the doctor's office meant the idiomatic meaning.

[luke]

It could be made into a very funny joke. Confused meanings are the basis for many funny jokes. They can also get quite rude, with double entendres.

[Cayte]

You're right. Sometimes double meanings can be quite rude and it depends upon how we interpret it. In fact, I found the sample before from an article about "Focus on Spoken Language". The writer mentioned that the newspaper was the best place to learn both spoken and written English, and cartoon or comic strip is the place to pick idiomatic phrases that can have two meanings.

[luke]

For sure, cartoons live off double meanings.

Newspapers are a great source of material, and always changing which helps to prolong our interest. I always advise my university students to read a daily English paper to improve their vocabulary.

A. Doctor, doctor, I feel like a pair of curtains
B. Well, pull yourself together!