This is the 2178th most frequent Chinese word.
撑
"撑" means "to support," "to prop up," "to push open," or "to hold out."
撑 here is used to mean 'to spread or open something out', such as an umbrella.
这把伞很大,足够撑起来遮住两个人。
This umbrella is big enough to spread out and cover two people.
撑 here means 'to fill or be filled to capacity', describing the feeling of over-saturation or fullness.
小明吃得太多了,他觉得肚子撑得慌。
Xiao Ming ate too much, he feels his stomach is too full.
撑 in this context means 'to endure or persevere', indicating the act of sustaining oneself through challenges.