2

Assuming my lungs were sufficiently powerful, could I blow the shofar for a mitzva if I blew into the wide end?

Related: Inhaling prayers?

6

Shulchan Aruch OC 586:12

והוא הדין אם תקע במקום הרחב, פסול (ר"ן פרק ב' דראש השנה).‏

It's invalid.

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