महाभारतः mahābhārataḥ - book-3, chapter-180, verse-28

गदासिचर्मग्रहणेषु शूरानस्त्रेषु शिक्षासु रथाश्वयाने ।
सम्यग्विनेता विनयत्यतन्द्रीस्तांश्चाभिमन्युः सततं कुमारः ॥२८॥

28. gadāsicarmagrahaṇeṣu śūrā;nastreṣu śikṣāsu rathāśvayāne ,
samyagvinetā vinayatyatandrī;stāṁścābhimanyuḥ satataṁ kumāraḥ.

28. gadāsicarmagrahaṇeṣu śūrān
astreṣu śikṣāsu rathāśvayāne |
samyak vinetā vinayati atandrīḥ
tān ca abhimanyuḥ satatam kumāraḥ

28. In the handling of maces, swords, and shields, in the knowledge of various weapons (astra), in other training, and in charioteering and horsemanship, Abhimanyu, the ever-diligent young prince, constantly instructs them properly as their teacher.

Words meanings summery:

• गदासिचर्मग्रहणेषु (gadāsicarmagrahaṇeṣu) - in the wielding of maces, swords, and shields

• शूरान् (śūrān) - the brave (sons) (heroes, brave ones)

• अस्त्रेषु (astreṣu) - in weapons, in projectiles, in the sciences of weaponry (astra)

• शिक्षासु (śikṣāsu) - in instructions, in trainings, in learnings

• रथाश्वयाने (rathāśvayāne) - in charioteering and horsemanship

• सम्यक् (samyak) - properly, completely, well, truly

• विनेता (vinetā) - instructor, trainer, disciplinarian

• विनयति (vinayati) - instructs, trains, disciplines

• अतन्द्रीः (atandrīḥ) - diligent, vigilant, not lazy

• तान् (tān) - them (the sons mentioned previously) (them)

• च (ca) - and, also

• अभिमन्युः (abhimanyuḥ) - Abhimanyu (son of Arjuna and Subhadrā) (Abhimanyu)

• सततम् (satatam) - constantly, always, perpetually

• कुमारः (kumāraḥ) - young prince, boy

Words meanings and morphology

गदासिचर्मग्रहणेषु (gadāsicarmagrahaṇeṣu) - in the wielding of maces, swords, and shields

(noun)

Locative, neuter, plural of gadāsicarmagrahaṇa

gadāsicarmagrahaṇa - wielding of maces, swords, and shields

Compound type : dvandva-tatpurusha (gadā+asi+carman+grahaṇa)

• gadā – mace, club
  noun (feminine)
• asi – sword
  noun (masculine)
• carman – shield, skin, hide
  noun (neuter)
• grahaṇa – taking, seizing, grasping, wielding
  noun (neuter)
  Action noun from root grah
  Root: grah (class 9)

शूरान् (śūrān) - the brave (sons) (heroes, brave ones)

(adjective)

Accusative, masculine, plural of śūra

śūra - hero, warrior, brave, powerful

अस्त्रेषु (astreṣu) - in weapons, in projectiles, in the sciences of weaponry (astra)

(noun)

Locative, neuter, plural of astra

astra - weapon (astra), missile, projectile

शिक्षासु (śikṣāsu) - in instructions, in trainings, in learnings

(noun)

Locative, feminine, plural of śikṣā

śikṣā - instruction, teaching, learning, study, art

From root śikṣ (to learn, to teach)

Root: śikṣ (class 1)

रथाश्वयाने (rathāśvayāne) - in charioteering and horsemanship

(noun)

Locative, neuter, singular of rathāśvayāna

rathāśvayāna - chariot and horse riding/driving

Compound type : dvandva-tatpurusha (ratha+aśva+yāna)

• ratha – chariot, car, vehicle
  noun (masculine)
• aśva – horse
  noun (masculine)
• yāna – going, moving, driving, riding, vehicle
  noun (neuter)
  Action noun from root yā (to go)
  Root: yā (class 2)

सम्यक् (samyak) - properly, completely, well, truly

(indeclinable)

विनेता (vinetā) - instructor, trainer, disciplinarian

(noun)

Nominative, masculine, singular of vinetṛ

vinetṛ - instructor, teacher, guide, trainer, disciplinarian

Agent noun from root nī with prefix vi-

Prefix: vi

Root: nī (class 1)

विनयति (vinayati) - instructs, trains, disciplines

(verb)

3rd person , singular, active, present (lat) of vi-nī

Prefix: vi

Root: nī (class 1)

अतन्द्रीः (atandrīḥ) - diligent, vigilant, not lazy

(adjective)

Nominative, masculine, singular of atandrin

atandrin - diligent, vigilant, active, not lazy

Compound type : nañ-tatpurusha (a+tandrin)

• a – not, non-
  indeclinable
• tandrin – lazy, weary
  adjective (masculine)

तान् (tān) - them (the sons mentioned previously) (them)

(pronoun)

Accusative, masculine, plural of tad

tad - that, he, she, it

च (ca) - and, also

(indeclinable)

अभिमन्युः (abhimanyuḥ) - Abhimanyu (son of Arjuna and Subhadrā) (Abhimanyu)

(proper noun)

Nominative, masculine, singular of abhimanyu

abhimanyu - Abhimanyu (a proper name, son of Arjuna and Subhadrā)

सततम् (satatam) - constantly, always, perpetually

(indeclinable)

कुमारः (kumāraḥ) - young prince, boy

(noun)

Nominative, masculine, singular of kumāra

kumāra - boy, youth, prince, son