When someone solecizes, they make a mistake in the way they use words or grammar.
If someone solecizes, it usually means they are not very good at using words correctly.
Examples:
She solecizes when she says 'he goed' instead of 'he went'.
He solecizes by using 'biggest' instead of 'most big'.
When I read his writing, he solecizes a lot.
He solecizes so much, it's like he's speaking a different language!
She solecizes every time she opens her mouth.
He solecizes like it's going out of style.