क्लैब्यं मा स्म गमः पार्थ नैतत्त्वय्युपपद्यते।क्षुद्रं हृदयदौर्बल्यं त्यक्त्वोत्तिष्ठ परन्तप॥
klaibyaṃ mā sma gamaḥ pārtha naitat tvayyupapadyatekṣudraṃ hṛdaya-daurbalyaṃ tyaktvottiṣṭha parantapa
Word by word
The verse says
Do not give in to this feebleness, Arjuna. It does not suit you. Shake off this small weakness of heart and stand up, you who burn through your enemies.
In plain words
Krishna keeps pushing. Stand up.
He calls the weakness kṣudram — petty, small. Not wicked. Small. Of all the things he could have called Arjuna's grief, he picks the word that means it is beneath him.
Then he names him by what he has done before: scorcher of enemies. He is telling Arjuna who he is, at the moment Arjuna has forgotten.
Where you've felt this · in sport
A coach does not tell the player who has frozen that the pressure is understandable. They say the one sentence that reminds him what he is capable of, and send him back on. Understanding can come afterwards.
Going deeper
The Sanskrit here is klaibya, and a reader deserves to know what it actually says. It means impotence, unmanliness. It is a harsher and more gendered word than most English versions admit, and translations that render it simply as weakness are softening it.
Why does Krishna reach for it? Because he is not making an argument in these two verses. He is applying a jolt. Arjuna has sat down; nothing can be taught to a man in that position, so the first job is to get him upright.
It is also worth noticing what Krishna does not do. He does not say the war is just. He does not answer a single one of Arjuna's points from Chapter 1 — not the ruined families, not the dead ancestors, not the sin. All of that gets no reply, ever.
The teaching proper does not begin until verse 11. Everything before that is Krishna clearing the ground, and Arjuna discovering that his position cannot survive being pushed.