A polite term (丁寧語 (teineigo)) for paper money.

a pond (small lake or pool) / a pool (small amount of liquid in a surface) / (calligraphy) part of an inkstone where water is stored

invasion; raid; attack; visitation (of a calamity)

お世話になりました, 御世話になりました: thank you very much for everything, I'm very obliged to you (for what you've done)