Meaning of the word "he who excuses himself, accuses himself" in English

What does "he who excuses himself, accuses himself" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

he who excuses himself, accuses himself

US /hi hu ɪkˈskjuːzɪz hɪmˈsɛlf, əˈkjuːzɪz hɪmˈsɛlf/
UK /hiː huː ɪkˈskjuːzɪz hɪmˈsɛlf, əˈkjuːzɪz hɪmˈsɛlf/
"he who excuses himself, accuses himself" picture

Idiom

a person who offers excuses for their actions, especially before being asked, is effectively admitting their guilt

Example:
I didn't even ask why he was late, but he started explaining everything; he who excuses himself, accuses himself.
When the suspect began providing alibis before being questioned, the detective thought, 'He who excuses himself, accuses himself.'