in like Flynn

Adjective

not-comparable slang

(slang) Having achieved a goal or gained access as desired.

Japanese Meaning

（俗）望み通りに目標を達成する、または望んでいたアクセスを得る状態 / （俗語）計画通りに物事が進む、または意図した結果を得ること

After the CEO approved his proposal, he was in like Flynn.

CEOが彼の提案を承認した後、彼は目的を達成していた。

Sense（1）

(slang) Having achieved a goal or gained access as desired.