[I'll bet you my bottom dollar] {interj.}, {informal} An exaggerated assertion […]

[I'll say] or [I tell you] {interj.}, {informal} I agree with […]

[I'll tell you what] or [tell you what] {informal} Here is […]

[I'm telling you] {informal} It is important to listen to what […]

[I.O.U.] {adj. phr.} I owe you, abbreviated; a promissory note. * […]

[ice] See: [BLOOD RUNS COLD] or [BLOOD TURNS TO ICE], [BREAK […]

[iceberg] See: [COOL AS AN ICEBERG].

[idea] See: [THE IDEA], [WHAT'S THE BIG IDEA] or [WHAT'S THE […]

[idiot box] {n.} A television set. * /Phil has been staring […]

[if] See: [WHAT IF].