not know the meaning of the word

/nˌɒt nˈəʊ ðə mˈiːnɪŋ ɒvðə wˈɜːd/

/nˌɑːt nˈoʊ ðə mˈiːnɪŋ ʌvðə wˈɜːd/

to not know the meaning of the word

to lack knowledge or understanding of a particular concept or term

Examples

1. He doesn't know the meaning of the word.

2. It would be true to say that he didn't know the meaning of the word impossible.

3. You might say, "I didn't know the meaning of the word to hold on, so I looked it up in the dictionary."

4. For years, most people did not know the meaning of the word meme.