This is the 8042nd most frequent Japanese word.
孕む
"孕む" means "to conceive, become pregnant, or to hold/contain (something potentially developing)."
In this sentence, '孕む' signifies that the earth contains or foreshadows the essence of spring's arrival, showcasing a metaphorical usage.
大地は春の訪れを孕んでいる。
The earth embodies the arrival of spring.
In this context, '孕む' is used in its literal sense, referring to the biological act of carrying offspring during pregnancy.
動物は一定の期間、子を孕む性質を持つ。
Animals have the ability to carry offspring for a certain period.
Here, '孕む' is used metaphorically to express a state or condition of carrying or being filled with something (joy, in this case).