to yawn
Yo no pude evitar bostezar.
I couldn't help yawning.
Tom trató de no bostezar.
Tom tried not to yawn.
Me gusta bostezar.
I like to yawn.
No habrá dormido bien porque tiene unas ojeras enormes y no para de bostezar.
She must not have slept well because she has huge dark circles under her eyes and keeps yawning.