Possibly from Proto-Mon-Khmer *bciip ~ *bciəp ~ *bcəp ~ *bcap ~ *bcaip ~ *bcup ~ *bcuup ~ *bcuəp (“to adjoin; to adhere”) and therefore related to chắp. Compare Koho jup (“be together; to follow, to help”).
giúp • (𠢞, 𠢟)