Here is a simple, plain-language way to understand the Atichaar Sutra (Ati-chaar), along with the original stotra text as given in Jain scriptures.

What is Ati-chaar?

• Ati-chaar means untruthful or improper conduct that crosses the boundaries of non-violence, truth, restraint, and proper conduct.
• The sutra explains eight types of Ati-chaar in the realm of knowledge and seven or so in other areas, describing what counts as excessive or wrongful behavior (and why it should be avoided) during different moral observances.

Simple meaning (arth) in everyday terms

• Knowledge time (ज्ञानाचारे): People should learn and teach with humility and honesty. Ati-chaar here means acting with hurry, pride, or disregard for truth when gaining or sharing knowledge, and giving or accepting teachings insincerely.
• Conduct and vows (चारित्राचार, इत्यादि): Don’t break vows or ethical rules out of anger, greed, or boastfulness. Avoid deceit, harming others, stealing, lying, or using religious ideas to justify wrongful actions.
• Self-restraint and discipline (तपाचार, वीर्याचार): Do not violate vows of restraint, such as improper conduct with others, or neglecting discipline in daily life.
• Domestic and social duties (आचार-व्रत संबंधी निर्देश): Do not misbehave in family or social settings, such as harming a spouse, family members, or others for personal gain.
• Possessions and wealth (परिग्रह परिमाण): Do not overreach or become obsessed with wealth or possessions beyond what is right; avoid deceit or harm to acquire them.
• Other detailed categories (various listed Atichaar): There are additional specific examples given in the sutra about how untruthful or improper conduct can manifest in speech, thinking, and action.

If you’d like, I can quote the exact verses in the original Devanagari and Gujarati text, then give a word-by-word or line-by-line simplification for each part.

You can read more here