From Wiktionary, the free dictionary
أَثَّرْتُمْ • (ʔaṯṯartum) (form II) /ʔaθ.θar.tum/
- second-person masculine plural past active of أَثَّرَ (ʔaṯṯara)
أثرتم (form IV)
- أَثَرْتُمْ (ʔaṯartum) /ʔa.θar.tum/: second-person masculine plural past active of أَثَارَ (ʔaṯāra)
- أُثِرْتُمْ (ʔuṯirtum) /ʔu.θir.tum/: second-person masculine plural past passive of أَثَارَ (ʔaṯāra)