way off base
off base
Incorrect; mistaken or misinformed; not aligned with reality. An allusion to baseball, in which baserunners are only "safe" if their foot is touching a "base." Hyphenated if used before a noun. Primarily heard in US. Your arguments would be compelling if your entire premise wasn't completely off base. You need to stop making these off-base assumptions about how the process works.
See also: base, off
Farlex Dictionary of Idioms.
way off (base)
 mod. on the wrong track; completely wrong.   (see also off base.) Sorry. You are way off. You should just give up. 
See also: base, off, way
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
- off base
 - way off
 - get (one's) wires crossed
 - get one's wires crossed
 - get your wires crossed
 - have (one's) wires crossed
 - have wires crossed
 - strike out at (something or some place)
 - hit (something) out of the (ball)park
 - game is not worth the candle, the