갤마주다

갤마 (gaelma, infinitive of the verb 갤마다 (gaelmada)) +‎ 주다 (juda, auxiliary verb forming benefactive verbs). The first verb is of uncertain etymology; it presumably means "to teach", but is almost never used outside this single compound verb.

갤마주다 • (gaelmajuda) (infinitive 갤마주어 or 갤마줘, sequential 갤마주니)

1. (southeastern Gyeongsang) to teach (something) to

   Synonym: (Standard Korean) 가르쳐주다 (gareucheojuda)

• Mainly used in the city of Changwon and its environs such as Miryang or Gimhae. Seems not to be used in nearby Busan.
• Other Gyeongsang varieties have 갤춰주다 (gaelchwojuda), 갈차주다 (galchajuda), etc., where the first verb is the general word for "to teach" and which corresponds directly to Standard 가르쳐주다 (gareucheojuda).