komu

Noun

 * 1)  rockfall

Pronoun

 * 1) to whom (dative)

Conjunction

 * 1) as, since

Noun

 * 1) oldest child (of a man), where ‘child’ has the scope of  (sons, daughters, children of a brother or sister of the same sex, etc.)
 * 2) son-in-law (of a man)

Usage notes
Reports vary on whether this term refers only to male oldest children or can be applied without regard to sex.