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Shutting out (all) external contacts and fixing the gaze between the eyrow, ealising the outgoing and incoming breaths moving within the nostrils.

Shutting out external contacts, fixing the gaze between the eyebrows, making even the outgoing and incoming breaths that move within the nostrils,

Krishna gives a short outline of meditation, which the sixth chapter will develop fully. The practitioner shuts out external contacts, keeping the sense objects outside the mind. The gaze is fixed between the eyebrows, and the outgoing and incoming breaths, prāṇa and apāna, are made even as they move through the nostrils. These are classic elements of yogic practice: withdrawal of the senses, concentration, and regulation of breath. The sentence continues into the next verse, which describes the inner state such practice supports.