In plain words
When Bhīma, saying this, went in his anger to kill Aśvatthāmā, Draupadī stopped him: ‘My sons will not come back. Do not kill Aśvatthāmā and give your guru's wife the grief of losing a son,’ she pleaded. Such an embodiment of sacrifice was Draupadī. Then Arjuna asked Draupadī whether his vow had then come to nothing.
One who is afraid, one who has suffered pain in misery, one who in sleep has lost himself, one who in pleasure has drunk liquor, one who, beaten, has fled, one of simple and witless nature, one who cries ‘Save me!’ and wails, and a woman: to kill these is not dharma, Arjuna!
That is, ‘Is it dharma to kill one who is frightened, one lost to himself in sleep, one who has drunk liquor, one who falls at your feet in terror, or women?’ Draupadī replied. At that moment Kṛṣṇa came: ‘Sister! Your husband is a man of great resolve in keeping his vows. Never once in his life has he broken a vow. So you must not bring on him the disgrace that his vow went unfulfilled. You know all the dharmas. You yourself tell Me the way out of this,’ He said. Draupadī means Pāñcālī, and that means ‘she who has brought sound, touch, form, taste, smell and the rest under her control’. ‘Look into your dharma as a pativratā with a subtle mind,’ said Kṛṣṇa.
She never answers back her husbands' many words; she never says she has no time to serve them; she is content with what she has: there is no pativratā to equal Draupadī.
Then Draupadī thought for a moment and spoke to Arjuna.