In plain words
Do not be afraid or bewildered on seeing this terrible form of Mine. Free from fear and with a joyful heart, behold once more this former form of Mine.
Word for word
Let there be no fear for you and no bewilderment, having seen this terrible form of Mine, such as it is; with fear gone and a glad mind, behold again that very form of Mine, this [one].
मा ते व्यथा मा च विमूढभावोदृष्ट्वा रूपं घोरमीदृङ्ममेदम्व्यपेतभीः प्रीतमनाः पुनस्त्वंतदेव मे रूपमिदं प्रपश्य
Other commentaries
The commentators
▸Bhagavadgītābhāṣyam· bhāṣya
मा ते व्यथा मा भूत् ते भयम् , मा च विमूढभावः विमूढचित्तता, दृष्ट्वा उपलभ्य रूपं घोरम् ईदृक् यथादर्शितं मम इदम् । व्यपेतभीः विगतभयः, प्रीतमनाश्च सन् पुनः भूयः त्वं तदेव चतुर्भुजं रूपं शङ्खचक्रगदाधरं तव इष्टं रूपम् इदं प्रपश्य ॥ ४९ ॥
In plain words
Don't be troubled. Don't be afraid. Don't let your mind stay tangled in confusion just because you saw that terrible form of mine as I showed it to you. Let the fear drain completely out of you, let your mind settle into joy, and look again — here is that same familiar four-armed form, holding the conch, the discus, the mace — the very form you love, the one you asked for. Look.
Close to the Sanskrit
Let there be no distress for you; let there be no fear for you; and let there be no bewilderment, no confusion of mind, from having seen, having perceived, this terrible form, such as it was, as shown, this of mine. With fear departed, with fear gone, and with a pleased mind, being so, again, once more, you — behold this very same four-armed form, bearing conch, discus, and mace, this desired form of yours.