約束は守らなければならない。

約束は守らなければならない。

One must keep one's promises.

約束(やくそく)は守(まも)らなければならない。

Yakusoku wa mamoranakerebanaranai.

約束 (やくそく)

promise; agreement; arrangement; one's word; contract; pact; appointment; engagement; date; convention; rule; destiny; fate

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

守る (まもる)

to protect; to guard; to defend; to keep (i.e. a promise); to abide (by the rules); to observe; to obey; to follow

Readings: ヤク、つづ.まる、つづ.める、つづま.やか

Meanings: promise, approximately, shrink

Readings: ソク、たば、たば.ねる、つか、つか.ねる

Meanings: bundle, sheaf, ream, tie in bundles, govern, manage, control

Readings: シュ、ス、まも.る、まも.り、もり、 -もり、かみ

Meanings: guard, protect, defend, obey