1
lying about one's age;age fabrication
See also:
年齢詐称 (ねんれいさしょう)
1
fraud;swindle;graft;cheating;trick;scam
See also:
オレオレ詐欺 (おれおれさぎ)
私の知る限り、彼はその詐欺の企みには関与していません。
To my knowledge, he has not been involved in the fraud scheme.
2
saying you're going to do something but in the end not doing it;making promises without keeping them;flaking out
as 行く行く詐欺, etc.; modeled from オレオレ詐欺