由	367C25   22.41	部居	畫數  5	ㄧㄡˊ [you2] .
N	Reason: 原由，理由 ditto; 事由 story or course of events; 情由 reason, how s.t. happened; 根由 basic cause.
V	To let: 由他去 let him do what he likes; 由性兒 [you2xing4er0]; 心不由主 lose mental control; 由不得 [you2bu0de0]↓, 笑罵由他笑罵 let them talk and criticize all they like.
Prep	From: 由乎，由於 from; 由於何因 from what cause? 因此，由是 [you2ci3], [you2shi4]↓; 由何而起 whence arises this? 由近而遠 from the close-by examples to those far off; 由淺入深 proceed from the simple to the more complex; 經由 via.
Words	1.由不得 [you2bu0de0], adv., (1)  in spite of oneself: 由不得大笑起 could not help laughing out loud; (2)  beyond one's control: 這事由不得你 this is s.t. you cannot control.  2.由打 [you2da3], adv., since: 由打昨夜 since last night (it has been raining ,etc.).  3.由衷 [you2zhong1], adj., from the heart: 言不由衷 talk insincerely; 由衷之言 a talk straight from the heart.  4.由兒 [you2er0], n., (coll.) reason (=源由).  5.由來 [you2lai2], (1)  adv., for a long time; (2)  n., a person's past record or antecedents.  6.由性（兒） [you2xing4er0], v.i., to be wilful.  7.由是 [you2shi4], adv., from this, hence: 由是可觀 one can see therefore.  8.由頭（兒） [you2tou0er0], n., a pretext: 尋出由頭兒來 find a pretext.  9.由此 [you2ci3], adv., hence, see [you2shi4]↑: 由此可見 thus it is seen that.  10.由由 [you2you2], adj., (AC) natural, unaffected.