坚
=
収
+
土
:
Joan of Arc (ji) built a strong (坚) and sturdy (坚) burrow out of dirt (土) in front of the anthill (an1). She even equipped it with a strong (坚) radio (収) to keep contact with her troops.
堅 character breakdown
The character 堅 cannot be broken down into individual components.
lit. looking up to it, it gets higher; boring into it, it gets harder (idiom) (from Analects) / fig. to delve deeply into one's studies / meticulous and diligent study