ichidan verb, transitive verb
Transitive verb meaning to cause something to expand or swell, often used for cheeks, balloons, or abstract things like expectations. Compare with intransitive 膨らむ (to swell by itself).
See also: 膨らます
子どもがほっぺたを膨らせて怒っている。
The child is puffing out their cheeks in anger.
風船を膨らせるのに時間がかかった。
It took time to inflate the balloon.