1
general::
Also, jump at the chance;jump at the bait. Take prompt advantage of, respond quickly to an opportunity. For example, When Dad said he'd help pay for my vacation, I jumped at the offer, or When the lead singer became ill, Sheila jumped at the chance to replace her, or They offered a large reward, hoping that someone would jump at the bait. [Mid-1700s]
American Heritage Idioms
2
general::
Phrase(s): jump at someone or something
to jump in the direction of someone or something. • The frog jumped at me, but I dodged it. • The cat jumped at the leaf as it fell from the tree., Phrase(s): jump at something
Fig. to seize the opportunity to do something. (See also leap at the opportunity (to do something).) • When I heard about John’s chance to go to England, I knew he’d jump at it. • If something you really want to do comes your way, jump at it.
McGrawhill's American Idioms And Phrasal Verbs