Growing to be long and thin, like a spindle or a stick.
Spindling can make people think of something weak or not healthy.
Examples:
The spindling plant reached for the sun.
The spindling tree swayed in the wind.
The spindling cat tried to catch the bug.
The spindling flower looked like a little stick.
The spindling tower was so tall and thin, it looked like it might fall over.
The spindling man was as thin as a stick.