How does verb concatenation work in Loloish languages such as Lahu?

In Loloish languages such as Lahu, verb concatenation is a prominent grammatical feature used to express complex actions. In this process, a speaker may juxtapose up to five verbs within a single verb phrase.1

Within these sequences, one verb functions as the semantic head, while the remaining verbs undergo grammaticalization or semantic bleaching to serve as modifiers. This allows the language to convey intricate meanings through a string of verbs that might otherwise require more complex syntactic structures in other language families.1

For example, the Lahu phrase γa qɔ̀ʔ yù tɔ̂ʔ pî translates to "have to take it out for him again." Literally, this sequence is composed of the verbs "obtain-return-take-emerge-give," where each element contributes to the overall aspectual or directional modification of the main action.1