This is the 14982nd most frequent German word.
schnappen
"To snap" or "to catch."
In this sentence, 'schnappen' means to catch or grab something, illustrating an action of capturing something physically.
Die Katze versucht, die Maus zu schnappen.
The cat tries to catch the mouse.
Here, 'schnappen' conveys the idea of quickly taking something, in this case fresh air or oxygen.
Ich muss schnell frische Luft schnappen.
I need to quickly catch some fresh air.
The use of 'schnappen' here refers to the act of quickly grabbing or stealing an item in a hasty manner.