Drop a bundle on (someone or something) phrase
To spend a large amount of money on someone or something
Parents drop a bundle on children's education in the hope of seeing their children successful.
Girls often drop a bundle on clothes and cosmetics.
The verb "drop" must be conjugated according to its tense.
The origin of this phrase is not clear.
To write something
Yesterday, he put pen to paper and replied to all letters from his fans.