also: くいつきがよい
expression, i-adjective
biting well; taking bait well; showing strong interest
Literally describes fish biting eagerly; figuratively means a person is very interested or enthusiastic about something, often used in the negative form 食いつきが悪い to indicate lack of interest.
今日は魚の食いつきがいい。
The fish are biting well today.
彼は新しいプロジェクトに食いつきがいい。
He shows a strong interest in the new project.
Compound of 食いつき (noun form of verb 食いつく 'to bite at, take the bait') + が + いい 'good'. The figurative sense derives from the fishing metaphor.