observe    kwītegereza, kurāba
(carefully) gukengūza, kwihwēza
(class distinctions) kuzīrōra
(to superstitiously ~ certain days) kuziririza
(a taboo) kuziririza
En-En dictionary 
kuzīrōra (-zīrōye)   v    to persist in old customs, to observe class distinctions
gukengūza (-kengūje)     v    1. to look carefully to see if anyone is there, 2. observe carefully
kuziririza (-ziririje)   v    1. to absolutely refuse, 2. to superstitiously observe certain days, 3. to observe a taboo
class    (of nouns or objects) umutigiri
(to observe ~ distinctions) kuzīrōra
En-En dictionary 
taboo    ikizira
(to be) kuzira
(to break) kurēngwa, kuzirūra, kugōka
(to observe) kuziririza
(to remove) kuzirūra
En-En dictionary 
distinction    itandukāniro
(to observe class ~) kuzīrōra
En-En dictionary 
 observe found in: Kirundi I (Study lessons)
lesson 3   Possessive Adjective
lesson 12   Verb –ri
lesson 25   Prefixless Present Tense
lesson 39   –ngahe (How many?)
lesson 57   Object Pronouns I
lesson 59   Object pronouns with Vowel-stem Verbs
lesson 67   Subjunctive
lesson 86   Demonstrative Adjectives I
lesson 89   Not Yet Tense
lesson 92   Dependent Not Yet Tense
lesson 94   Relative Clauses
lesson 99   Uses of Prepositional Form
lesson 117   Ka Tense
lesson 123   Narrative Tenses I
lesson 124   Narrative Tenses II
 observe found in: Kirundi II (Grammar)
chapter 27   Transitive and Intransitive Verbs
chapter 32   Intensive expressed by the Infinitive
chapter 62   nguyu, etc.
chapter 73   How to say “without”
chapter 79   Various Expressions