This is the 5645th most frequent Japanese word.
しまお
The word "しまお" does not have a direct standalone meaning in Japanese and may be a name or require context for interpretation.
The term "しまい" is used to express completing or ending something, indicating the conclusion of work or activity in this context.
このままでは仕事をしまいそうです。
At this rate, it seems the work will be finished.
Here, "しまう" (as "しまっている") means to stow or keep something securely, in this context referring to keeping a secret hidden or private.
彼は秘密をしまっている。
He is guarding the secret.
In this sentence, "しまおう" is the volitional form of "しまう," used to suggest or decide to take action to put something away, specifically laundry before the rain.