bixma'u lujvo

b1=m1 is adolescent / pubescent / maturing in development-quality m2 (ka) by standard x3.

Cf. binxo, makcu, xadbixma'u, bavyfarvi, citnau.

In notes:

citnau
n1=c1 is a youth/young man by standard c2.
xadbixma'u
xa2=b1=m1 is adolescent/pubescent/in puberty/maturing in physical/bodily development-quality m2 (ka).