be under no illusion

US /biːt əˈraʊnd ðə bʊʃ/
UK /biːt əˈraʊnd ðə bʊʃ/
"be under no illusion" picture
1.

tidak berkhayal, tidak salah faham

to understand the true facts of a situation and not have false ideas

:
You should be under no illusion about the difficulty of this task.
Anda seharusnya tidak berkhayal tentang kesukaran tugas ini.
We are under no illusion that this will be easy.
Kami tidak berkhayal bahawa ini akan mudah.