I am translating something and i cant delucidate what it the meaning of sweetened in this phrase

Can you help me?

I do not need its translation just a synonym or its meaning Thanks!!

"The Royal bank of Scotland sweetened its 71 billions bid for another bank "

I'm pretty sure that in this case they mean that The Royal Bank of Scotland increased the amount it was bidding for another bank.

Thanks perch

Yep, that's the same way that I understood it. :)