It might take me a moment to reply because I'll be checking words in the dictionary
Sorry if my replies are delayed a little - I sometimes need to check words in the dictionary
I'll need to use a dictionary so it might take me a while to reply.
「辞書を引きながら話すから返事が遅いかもしれないけど」= It might take me a moment to reply because I'll be checking words in the dictionary / Sorry if my replies are delayed a little - I sometimes need to check words in the dictionary / I'll need to use a dictionary so it might take me a while to reply.
ボキャブラリー
might = かもしれない
take = (時間などが)かかる
a moment = 時間(がかかる)
reply = 返事する
check words = 単語(の意味)を確認する、(辞書を)引く
delayed = 遅い、遅れている
a little = 少し
sometimes =時々
need = 必要になる