gähnen
to yawn
As an involuntary reaction, often when tired or bored, to open the mouth wide and breathe in and out deeply.
Ich bin so müde, ich muss die ganze Zeit gähnen.
I'm so tired, I have to yawn all the time.

to yawn / gape
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to yawn
As an involuntary reaction, often when tired or bored, to open the mouth wide and breathe in and out deeply.
Ich bin so müde, ich muss die ganze Zeit gähnen.
I'm so tired, I have to yawn all the time.

The two meanings of 'gähnen' (to yawn / gape) are easy to distinguish by their grammatical form. When a person or animal 'gähnt' (yawns), it is used as a verb. The figurative meaning for an emptiness or abyss almost always appears as the adjective 'gähnend' (gaping).
Mein Hund gähnte und legte sich schlafen.
My dog yawned and lay down to sleep.
When someone yawns, this is often described more precisely with adverbs or prepositional phrases. Typical expressions are 'herzhaft gähnen' (to yawn heartily), 'tief gähnen' (to yawn deeply), or 'vor Müdigkeit gähnen' (to yawn from tiredness).
Der Student in der letzten Reihe gähnte herzhaft.
The student in the last row yawned heartily.
In the figurative meaning, the participle 'gähnend' (gaping) is used like an adjective before a noun. It describes a large, empty, and often threatening expanse. The most common combinations are 'gähnende Leere' (gaping emptiness) and 'ein gähnender Abgrund' (a gaping abyss).
Als ich den Kühlschrank öffnete, sah ich nur gähnende Leere.
When I opened the refrigerator, I saw only gaping emptiness.