Senses
弟 younger brother
(bound form) younger brother; a junior male relative of the same generation; a junior male friend
弟 I
a modest way to refer to oneself, used when writing to male friends or colleagues of roughly the same age
弟 disciple
(bound form) student; disciple; follower
弟 brotherly duty
to perform one's duty as a younger brother; to show respect to one's elders
弟 surname
a Chinese surname
弟 order
order; sequence; grade
弟 merely
(literary) merely; only; but