吃奶之力

all one's strength

to eat / to consume / to eat at (a cafeteria etc) / to eradicate / to destroy / to absorb / to suffer / to stammer (Taiwan pr. for this sense is [ji2])

variant of 吃[chi1]

to suck the breast (for milk)

breast / milk / to breastfeed

variant of 嬭|奶[nai3]

mother / variant of 奶[nai3]

(possessive particle, literary equivalent of 的[de5]) / him / her / it

power / force / strength / ability / strenuously