I am not sure about both usages are correct.If both of them are correct, can you clarify the differences.
I couldn't understand what you mean/meant.

  • Please add examples that confused you so that we know can give a better answer. – BlackSwan Jul 1 '17 at 11:50

Mean is simple present tense.

Meant is simple past tense.

In that sentence, meant would be correct because could is simple past tense.


"Mean" is present tense, while "Meant" is past tense:

What do you mean by that? (present tense)

Did you mean .... ? (present tense)

What he meant to say was .... (past tense)

  • 1
    (looks like mik_blom finished typing his answer faster than me :) ) – JerryTheC Jul 1 '17 at 12:09

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